Aug 19, 2020 The behavior typically occurs when a device driver is not written for an x64-based version of Windows. This behavior can also occur if the device driver is correctly written for an x64-based version of Windows, but the installation.inf file is incorrectly decorated. Long description: I'm using the Cypress Suite USB 3.4.7 development kit to create a USB driver for our instrument to run under Windows 7 64-bit. I've configured the INF with the proper IDs and the unsigned driver works fine as long as I by bypass driver signature enforcement. On a x64 bit system for a x64 bit driver: a. Go to Start Run and enter the following: odbcad32.exe (By default this will load the odbcad32.exe from C:WindowsSystem32odbcad32.exe). Click OK and the Registry Editor will open. On a x64 bit system for a x32 bit driver: a. Go to the following path C:WindowsSysWOW64 and open the odbcad32.exe. The problem is that Windows setup does not have a native NVMe driver included. I am not all that familiar with loading external drivers during Winodws setup but I do know that you will have to have the driver for the NVMe disk controller available either on a second USB flash drive or possibly on the same Windows 10 USB flash drive.

1. Windows X64 Driver Rtkvac64.sys Not Found
2. Windows X64 Driver Rtkvac64 Sys Not Found Windows 10
3. Windows X64 Driver Rtkvac64 Sys Not Found Guilty

The 'missing operating system' or 'operating system not found' error message usually appears on a black window when you start Windows computers. It would prevent you from booting Windows. This error is very common for Dell, Acer, Lenovo, HP, and Sony desktops and laptops. You can read on to get error details or skip directly to solutions.

Causes of Missing Operating System/Operating System Not Found

Generally, when something goes wrong with the BIOS configuration, hard drive health, or the Master Boot Record (MBR), you can't boot the Windows and will see the mentioned two error messages. To be specific, the causes that lead to Operating System Not Found are as follows.

• The basic input/output system (BIOS) does not detect the hard disk
• The hard disk drive is damaged
• Improper/incorrect BIOS settings
• Windows Master Boot Record (MBR) is corrupt/damaged
• An incompatible partition is set as active

Note: If the BIOS fails to detect the operating system, you will receive one of the following error messages, which tells the same problem on different operating system versions.

Error message 1: Missing Operating System

Error message 2: Operating system not found

7 Solutions to Fix Operating System Not Found or Missing

After knowing the causes for an operating system not found or missing in Windows, now it's time to apply effective solutions to restore the missing operating system.

Solution 1. Check if the hard drive is detected by BIOS

Step 1: Press and hold 'F12/F10' while pressing the 'Power' button to turn on the PC.

Step 2: Release F12/F10 when the BIOS Setup Utility is displayed.

Step 3: Try to find IDE Primary Master, IDE Primary Slave, IDE Secondary Master, and check whether they can be detected or not.

If no disk is shown or displayed as None/Not Detected, it means that the BIOS doesn't detect the drive and you may select None to Auto. This may solve OS not found error.

If the system disk information is displayed, it means that BIOS can detect the hard drive and you need exit BIOS.

Solution 2. Test hard drive problems

Step 1: Press and hold 'F10' and press the 'Power' button to turn on the PC > Release F10 after the PC screen display you with a test.

Step 2: Use the right arrow to select the 'Tools' menu in the BIOS Setup Utility.

Step 3: Then select 'Hard Drive Self Test' > Press 'Enter' to start the test.

After the test, you'll get two results:

#1. All tests passed

the hard drive is not damaged. You may jump to Solution 3 to reset BIOS to the default state.

#2. The test failed

You should contact your hard disk or computer manufacturer for a replacement as long as these devices are under warranty.

Solution 3. Set BIOS to default settings

Improper settings or incorrect BIOS settings may also cause the issue 'operating system not found' in your PC. You can try to set BIOS to default settings to solve the problem.

Step 1: Restart PC and enter BIOS.

Step 2: Find BIOS and enable the default setup option, including Load Optimal Defaults, Get Default Values, Load Optimized Defaults, Load Setup Defaults, and so on.

Step 3: Press 'F10' to save changes and quit from BIOS.

If this method doesn't work, the MBR disk could be damaged and you may jump to Solution 4 to find the MBR disk repair method.

Solution 4. Repair MBR with the installation CD/DVD

Both wrong operation and virus infection can damage MBR, which locates in the first sector - usually sector 0 of the hard disk. Thus, Windows will not boot. You can try to repair MBR using the Windows installation disk in Command Prompt.

Insert Windows Operating System Disc to the optical (CD/DVD) drive

Step 1: Press the 'Power' button to turn on the PC > Hit 'Enter' when Boot from CD prompt.

Step 2: Press 'R' key in Windows Setup Menu to start the Recovery Console.

Step 3: Type: FIXMBR at the C:> prompt and hit 'Enter'.

Step 4: Press 'Y' key > hit 'Enter' when asked if you want to write a new MBR.

Step 5: Restart PC by pressing the 'Power' button when the MBR completes the writing process.

Solution 5. Rebuild MBR without Windows installation CD/DVD

If you prefer an easier and safer way to rebuild or repair the MBR disk, you may apply third-party partition magic software - EaseUS Partition Master to perform an automatic repair.

Boot your Windows from the WinPE environment you created and start to repair MBR with a few clicks.

Step 1.Create a WinPE bootable disk.

• Download and launch EaseUS Partition Master on a new PC which runs the same system as yours.
• Click 'WinPE Creator' on the toolbar. And select to create the bootable disk on a USB drive. If your computer has a CD/DVD drive, you can also create the bootable disk to CD/DVD.
• Click 'Proceed' to finish the process.

Step 2.Rebuild MBR.

• Connect the bootable USB or CD/DVD to your PC.
• Press 'Del' when you are restarting the computer. Boot your computer from 'Removable Devices' or 'CD-ROM Drive'. And then EaseUS Partition Master will run automatically.
• Right-click the disk whose MBR is damaged. Choose 'Rebuild MBR' to continue.

• Select the type of MBR with the current operating system. Then, click 'OK'.

• Click the 'Execute 1 Operation' button at the top-left corner and click 'Apply' to build the MBR. After that, your computer can boot normally again.

Solution 6. Repair MBR for HP

Solution 4~5 to corrupted MBR repair is applicable to various computer/laptop brands. On top of that, some brands provide customers with inbuilt tools to deal with MBR issues. For example, the Windows Operating System Disc (OSD) provided with HP notebook PC can be used to repair the Master Boot Record.

Follow all steps at https://support.hp.com/us-en/document/c00476274

Solution 7. Set the correct partition active

When Windows is running under Legacy BIOS + MBR mode, the boot partition/system partition should be set as active so that MBR can pass boot right to boot manager and find Windows. If the system partition or boot partition is not set to active, you may encounter the operating system not found issue.

In the same partition tool, create the EaseUS Partition Master bootable USB first, and follow the steps to set the boot partition active:

Step 1. Download and launch EaseUS partition manager software.

Step 2. On the disk map, right-click the desired partition and choose 'Set Active'. The software will automatically execute the operation and create an active partition for you.

Conclusion

All effective solutions to the 'Missing Operating System' or 'Operating system not found' error are carefully presented on this page. You may try any one of the methods to resolve the issue and get a healthy Windows system back and continue using your computer again.

Having problems with your Firewire port not recognizing devices connected to it? Your not alone.
We found a problem when we tried to use the FireWire port on our computers that were running Windows 10 ( and also Windows 7 and 8). We were trying to import video into Vegas Pro and Adobe Premiere, and we quickly found out that we couldn’t import video into the computer via the FireWire port. We never had this problem way back when we were running Windows XP.
At first we thought this was a compatibility problem between Windows 10 (Windows 7 and 8) and Vegas and Adobe Premiere, but we quickly ruled that out when another program we have also had problems using the Firewire port.
However, we have the fix for this problem and it is with the Firewire driver (a.k.a. the 1394 Driver) that comes with Windows 10 (and Windows 7 and 8).
This article contains a lot of information for connecting Camcorders, Editing Deck, Scanners, Hard Drives and Audio equipment. Please read the article first, then go back and follow the instructions to correct the problem.

A Couple of Things You Need to Know Before We Get Started
There are Different Types of Firewire Ports
There are 3 different types of Firewire ports as shown below.
The FW 400 ports are 4 pin and 6 pin. These are the more common Firewire ports. These are also known as 1394a ports. The FW800 is also know as a 1394b port. If you need to buy a Firewire card for your computer, unless you have a specific need for a Firewire 800 port, I strongly recommend you buy a Firewire card with just Firewire 400 ports. See a little farther below as to what Firewire Cards (IEEE-1394 cards) I recommend.
The Firewire Port
You MUST have either a Firewire port on the computer's motherboard or you have to install a Firewire card into one of the expansion slots. Otherwise, the Firewire Drivers will not see the Firewire port, as the driver looks for a Firewire chipset.
If you don't have Firewire port on the motherboard, they you will need to add a Firewire 400 (or IEEE 1394a) expansion card into one of the slots on the motherboard. Firewire cards are not expensive and they should only run you about $20 to $25. If the Firewire card comes with drivers, do NOT install them. You will need to install the Microsoft 1394 Firewire driver from this web page.
Below is a photo of two Firewire cards that I strongly recommend to use. They are basically identical, one has 3 ports and the other has 4 ports. They are sold under various brand names on Amazon. These are the cards I use here at Studio 1 Productions.
You may find some Firewire cards being sold that cost up to $60+ dollars. Don't waste you money on those, the $20 to $25 cards work just as well, in fact the less expensive ones actually worked better and they are pictured below.
Note: You may have people tell you that you need a Firewire Card or IEEE 1394 card with a TI chipset. That is not true anymore. I have tested over a dozen Firewire cards and the cards with the VIA chipset, like shown below actually worked better than the couple of card with the TI chipset. The TI chipset are found on the more expensive cards, but they don't seem to work very well in Windows 10.
The above cards have both a Firewire 4 pin and 6 pin ports.
When you buy a Firewire card try to find one that looks the the photos above. Remember, they are sold under various brand names.
I tested the 12 different Firewire cards with a Sony DCR-VX2100 camcorder, a Sony DSR-30 MiniDV/DVCam editing deck and a Panasonic AG-DV2000 editing deck. The Firewire cards (IEEE 1394 cards) via the VIA chipset worked with all 3 devices with no problems.
However, the few cards that had the TI chipset, they would not connect to the Panasonic AG-DV2000 or the Sony DCR-VX2100. No matter what I tried, I just could not get them to work with these devices. They would only connect to the Sony DSR-30 editing deck. The TI chipset cards gave me so many problems, so please stay away from them and only get the VIA chipset card.
What about a Firewire to Thunderbolt adapter?
Using these adapters will not give you a real Firewire port that can be seen by the Firewire driver. It will only show up as a Thunderbolt port in Device Manager and not as a Firewire port. As I stated above, the Firewire driver looks for a Firewire chipset on either the motherboard or on an expansion card that is plugged into one of the slots on the motherboard..
I have seen some YouTube videos showing that you can use a Apple Brand Thunderbolt 3 to Thunderbolt 2 adapter and then another Apple brand Thunderbolt 2 to Firewire adapter to capture video from a MiniDV camera using a program called HDVSplit. I have talked to about 14 different people on various forums about capturing MiniDV footage this way and only 2 people said they were able to get this to work, everyone else were unsuccessful. I recently tried using these adapters myself and I could not get it work. So I don't recommend wasting your money and time on Thunderbolt adapters as a way to capture video from a MiniDV camcorder or MiniDV editing deck, they don't work for that.
Most video capture software or audio processing software or scanner software need to work directly with the Firewire driver and the Firewire driver will never see a Firewire port chipset since it is not built-in to the motherboard or installed in an expansion slot.
With all of that said, I have seen people who have used the above adapters to connect an external Firewire hard drive to a computer via the Thunderbolt port, with success. That is because, Windows see it as a Thunderbolt device and not as a Firewire device and the Firewire driver is NOT involved.
FireWire to USB Adapter Issues - Do NOT Use. These adapters do NOT work for video and audio transfers. FireWire transfers data as a steady stream, while a USB connection transfers data as packets and thus they are not compatible. While there are Firewire to USB hubs (not adapters as shown below), these are more expensive than a FireWire card for your computer and some users have complained that the hubs are problematic.
Users have reported that they have electrically damaged the Firewire port on their camera or electrically damaged the USB port on their computer when attempting to use a Firewire to USB adapter. Please, do NOT use a Firewire to USB adapter!
Firewire Ports that are built-in to the Motherboard.
If your motherboard has a Firewire port, you will need to go into the BIOS and look for a setting that says something about the Firewire Port or IEEE 1394 or 1394 port. You will need to make sure this is set to Enable or ON.
If your motherboard has a Firewire port, but you are not going to use it and you are going to use an IEEE 1394 Firewire expansion card, then you will still need to go into the BIOS and set it for Disable or OFF.
Video Capturing Software
Check with your editing software to see if it still supports capturing video through the Firewire port. Some software only allow you to work with footage that comes from an SD card or from the Hard Drive. We use Vegas Pro and Vegas Movie Studio and both of those software packages support capturing video through the Firewire port.
Make sure what ever video capture program you are using, that you turn off the Device Control in the video capture program. If it is not turned off, you may run into problems trying to capture the video footage. Below is an example of the Vegas Pro and Vegas Movie Studio video capture software and where to disable DV device control.
Using a Firewire connections with a Digital Audio Workstation (DAW)
Depending on the version of the software you are using, you will need a Firewire port on the motherboard or a Firewire card plugging into the expansion slot. Depending the the software you may also need a special driver for the audio software, in addition to the Firewire Driver. Farther down in the article, under Step 13, I show you have to check to see if the Device Manage will see the connected audio device.
Using a Firewire connection with a Photo an Slide Scanners
If you have a scanner, such as a Nikon scanner, you may find it will not work with Windows 10, even if you have a built-in Firewire port or a Firewire expansion card. The problem here is the scanner driver will not work under Windows 10. However, you can try this piece of software: VueScan Scanner Software. Download the demo version of the software and try it out. This have solved problems for people using Canon, Nikon and a host of other scanners that are connected through the Firewire port. Don't worry if the scanner doesn't show up in the Device Manager, as long as the device manager sees the Firewire Driver, the above scanner software should find it.
Mouse Clicks
In this article, when we say to Click or Left Click, you will use the Left mouse button, as shown below. When we say Right Click, you want to click the Right mouse button, as shown below.

For Windows 10 and Windows 8 you will need to download the Legacy driver from below in the section marked The Fix for Windows 10 and Windows 8. Here we will show you step by step instructions, along with screen shots on downloading, installing and setting up the Firewire Drives.
For Windows 7 users, please skip down to the section titled 'The Fix for Windows 7'.

The Fix for Windows 10 and Windows 8
With Windows 10 and 8, Microsoft left out the Firewire Legacy driver version. Please follow these steps exactly. In fact, you might want to read through them first, the go back and follow each step. I have provided screen shots for each step. If you are running Windows 8, the steps are exactly the same for Windows 10.

Step 1
Now download theMicrosoft Firewire 1394 Legacy Driver Installer and remember where you downloaded the file to. Then once you have downloaded the installer, follow the instructions below.

Find where you downloaded the file to. It will have the filename 1394_OHCI_LegacyDriver.msi as shown above.

Step 2
Then RIGHT click on 1394_OHCI_LegacyDriver.msi Next, click on Install as shown below. This will load the drivers to C:Program Files (x86)1394 OHCI Compliant Host Controller (Legacy) folder. NOTE: It will only take a second or two to install and it may not show you any messages when it is done installing.

Step 3
Go to the folder C:Program Files (x86)1394 OHCI Compliant Host Controller (Legacy), and open the folder.

Step 4
Once you open the 1394 OHCI Compliant Host Controller (Legacy) folder, you will see two folders. One is the x64_driver folder and the other is the x86_driver folder. Most people are running a 64 bit systems under Windows 10, so you will need to open the x64_driver folder. If you are running a 32 bit system, then you will need to open the x86_folder.

Step 5
Once you have opened the correct folder, again most people will be opening the x64_driver folder, you will see four files as shown below. RIGHT click on the Legacy1394.inf file and then click on install. This will install the Firewire 1394 Legacy Drivers. NOTE: It will only take a second or two to install and then it returns you to the folder with no message that it has installed. But, don't worry it has installed.

Step 6
Open the Control Panel and click on Device Manager. Look for the line that says IEEE 1394 host controller.
NOTE: If you don’t see Device Manager listed in the Control Panel, click on View By: Category on the top right side of the Control Panel Window. Then Click on Large Icons you should now have a list of items in the Control Panel and click on Device Manager.
NOTE: If you do not see IEEE 1394 host controller listed in the Device Manager.
1. If you are using a Firewire Port that is built into the motherboard, then go into the system BIOS and look for a setting that says something about the Firewire Port or IEEE 1394 or 1394 port. You will need to make sure this is set to Enable or ON. Save the BIOS settings and reboot the computer. Now check to see if the IEEE 1394 host controller shows up in the Device Manager. If it does NOT, then you probably have something wrong with the Firewire Port on the motherboard. You will need to purchase a Firewire Expansion Card that plugs into one of the slots on the motherboard.
2. If you are using a 1394 Firewire expansion card, then you will still need to go into the BIOS and set it for Disable or OFF. Save the BIOS settings and reboot the computer. Next, check to see if the IEEE 1394 Host Controller is listed in the Device Manager. If it is NOT listed, then try moving the Firewire Expansion Card to another slot. Make sure you power off the computer before moving the Firewire card to another expansion slot. Now see if it shows up in the Device Manager. If it still does not show up, make sure the Firewire has the VIA chipset. Sometimes Firewire cards that have the TI chipset will not be seen in the Device Manger and you will not be able to use it. If you have a Firewire with the VIA chipset, you make have a defective Firewire card. Try purchasing another card and see if it works.
Below is a sample of what the Device Manager will show.

Step 7
Look down the list for IEEE 1394 host controllers and click on the arrow next to it. You will see the name of your 1394 OHCI Compliant Host Controller like shown below.
RIGHT click on the name of your 1394 OHCI Compliant Host Controller and click on Update Driver.

Step 8
Then select Browse my computer for driver software. As shown below.

Step 9
Select Let me pick from a list of available drivers on my computer as shown below. Then click on Next.

Step 10
A list of 1394 drivers will be shown. Select the 1394 OHCI compliant Host Controller (Legacy), then click next as shown below.

Step 11
Now you should see the screen below, saying Windows has successfully updated your drivers.

Step 12
When you check 1394 OHCI Compliant Host Controller (Legacy) as shown below.
NOTE: If you don't see the Legacy driver as shown below, you may need to reboot your computer and then check the Device Manager again.

Step 13
Connecting different Firewire device to your computer and verifying the connection with Device Manager.
I have three different examples below, depending on the type of device your are connecting to the Firewire port.
First Example:Connecting a Camcorder or MiniDV editing deck. (Also a flat bed scanner, slide or photo scanner)
Connect the Camcorder, MiniDV deck or scanner to the Firewire port using a Firewire cable. Once you are connected, power on the device.
Go back into the Device Manager. If you have connected a camcorder, a editing deck or a scanner with a Firewire port, then look for Imaging devices as shown below. Click on the arrow next to it and it will show you what is connected.
NOTE: If it doesn't show any thing under Image device, then you are not connect to a Firewire device. Check the following things:
1 Look under other devices that are listed to see if the device, such as a scanner, shows up.
2. Make sure your Firewire cable is plugged in all the way at both ends.
3. Try a different Firewire port.
4. Try a different Firewire cable.
5. Make sure the device you are connecting to the Firewire cable is powered on.
6. If you are attaching a scanner to the Firewire port, you most likely need the software from this website: VueScan Scanner Software. Download the demo version of the software and try it out.
Second Example:Connecting a Hard Drive with a Firewire port.
Connect the Hard Drive to the Firewire port using a Firewire cable. Once, your connected, the power on the device.
Go back into the Device Manager. Click on the arrow next to Disk Drives. This will show you all of the disk drives connection to the computer, including the external Firewire Hard Drive as shown below.
NOTE: If the Hard Drive doesn't show up under Disk Drives, then check the following things:
1 Look under other devices that are listed.
2. Make sure your Firewire cable is plugged in all the way at both ends.
3. Try a different Firewire port.
4. Try a different Firewire cable.
5. Make sure the device you are connecting to the Firewire cable is powered on.
Third Example:Connecting an Audio Device with a Firewire port.
This example shows connecting an M-Audio NVR-10 Firewire port using a Firewire cable. Once, your connected, the power on the device.
Go back into the Device Manager. Click on the arrow next to Sound, Video and Game Controllers. This should show you the Audio device connected to the computer. In the example below, it shows you the M-Audio NRV-10 connected.
Also, it show up under Other Devices, as shown below. Depending on the audio equipment you are connecting will depend on where it shows up. Note: Depending on the audio device you are trying to connect, you may need install an audio driver for the device along with the Legacy Firewire driver.
NOTE: If the Audio device doesn't show up under Sound, Video and Game controller or under Other Devices, then check the following things:
1. See if it needs a separate audio drive for that specific piece of equipment.
2. Look under other devices that are listed.
3. Make sure your Firewire cable is plugged in all the way at both ends.
4. Try a different Firewire port.
5. Try a different Firewire cable.
6. Make sure the device you are connecting to the Firewire cable is powered on.

Windows X64 Driver Rtkvac64.sys Not Found

NOTE: Over the years I have seen twice were a major Windows has reset the Firewire drive back to the original driver. This has not happened in the last 5 years, so it is nothing to worry about. I just wanted to mention it, in case it should ever happen again. If for some reason, the Firewire port stops working, just go into Device Manager and make sure the IEEE 1394 device drive is still set to Legacy.

The Fix for Windows 7
For Windows 7 simply replace the new 1394 driver with the Legacy driver that comes with Windows 7.
Below is the step by step instructions on how to install the Legacy driver so you won‘t have any problems either:
Click Start
Then click on Control Panel
Click on Device Manager
Note:If you don’t see Device Manager listed, click on View By: Category on the top right side of the Control Panel Window. Then Click on Large Icons you should now have a list of items in the Control Panel and click on Device Manager.
Under the Device Manager, look down the list for IEEE 1394 Bus Host Controllers and Double Click on it.
It should display something like - 1394 OHCI Compliant Host Controller
Note: If it has the word (Legacy) behind it, you are already setup and you can just exit out.
Next, double click on the 1394 OHCI Compliant Host Controller
A window will popup saying 1394 OHCI Compliant Host Controller Properties
Click on the Driver Tab
Then look down in the widow and click on Update Driver
Then select - Browse my computer for driver software
Next select - Let me pick from a list of device drivers on my computer
It will bring up a list of drivers.
Click on 1394 OHCI Compliant Host Controller (Legacy)
NOTE: It is important that you select the one with (Legacy) after it, just like shown above.
Then click Next
Once it installs the 1394 OHCI Compliant Host Controller (Legacy),
it will say Windows has successfully updated your driver software.
Click on the Close button and exit out of all of the other windows.
Then Reboot your computer.
You will now be able to import video via the FireWire port on your computer.
If you are still having a problem importing video after you have switched the FireWire driver to Legacy, then the problem may be with the FireWire port. This is a common problem. The FireWire port will work with an external driver, but it won't let you import video from your video camera. Most people report this problem with Dell computer, but it does happen with other brands, even brand new computers. This problem is usually with the FireWire port that is built into the motherboard.
The fix is simple:
1. Install a FireWire card into one of the open slots in the computer
2. Using the instructions above, set the drive to Legacy.
3. Reboot the computer.
4. Then connect the FireWire cable from the video camera, into the new FireWire port that you just added.
This fixes the problem 99% of the time. FireWire cards are not the expensive, they run from $20 and up, depending on any extra features the card may have.
NOTE: We have noticed that when Microsoft has issued certain updates, it can cause Windows 7 to switch back to use the original 1394 OHCI Compliant Host Controller driver. If you notice the FireWire device is transferring slowly or not working, then just repeat the above steps and reinstall the Legacy driver.

Troubleshooting Section

You Can't Capture Video or Control the Video Camera
We have run into to this problem ourselves.
1. Make sure the software you are using still works with Firewire capture. I know that the latest version of Adobe Premiere Elements no longer support video capture through the Firewire Ports.
2. Some video editing or video capture software no longer supports device or camera control through the Firewire port. We have this problem with our video editing software. So here is what we do. Make sure the camera or playback deck it connected to the computer. Then press the record or video capture button in the software. Then manually press play on the camera. You should be able to capture the video now. If for some reason you can't, then you will need to check the software settings or see if the software you are using has a user forum, and ask for help there.
Dell Computers
Note: I received an email from Mike Tilka and he was having a problem getting the FireWire port working on his Dell XPS 8100 and on an Gateway computer with the drivers from above. He said he needed to get the driver from this link for his computers:
http://www.driverscape.com/manufacturers/dell/laptops-desktops/studio-xps-8100/134
If you have a Dell or a Gateway computer and the above fix doesn't work for you, then you might want to try the above link.
This fixes the problem 99% of the time. FireWire cards are not the expensive, they run from $20 and up, depending on any extra features the card may have.

Windows X64 Driver Rtkvac64 Sys Not Found Windows 10

Windows X64 Driver Rtkvac64 Sys Not Found Guilty