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Heres a detailed way on how to fix that "Unknown device" Error. It appears that you will have to manually show the device manager where to look, but first you need to download the driver. How I fixed mine was first going through this site:

[REDACTED]

I selected the 64bit download. Extract the download in a folder and go to device manager.

Here right click on Unknown Device and click Update Driver and then let it know the location of the folder.

Thats how I succeeded and thought it would be worth posting this to save time.

Hello all,

I had to break the link that was sending you to an outside site. The best way to handle this is to:

1. Switch the TrackIR to a different USB port (sometimes this resolves the issue by itself)
2. Open Device Manager
3. Locate the unknown device
4. Right click and select "Update driver software"
5. Select "Browse my computer for driver software"
6. Locate the correct file. (Default install location is: C:\Program Files (x86)\NaturalPoint\USB Drivers x64\npusbio_x64)
7. Click Next and follow instructions to finish the process.

That should install the latest appropriate drivers. If that does not resolve the issue, please contact us at help.naturalpoint for the most current official drivers.

Regards,