If your desktop is Windows 7, you might need to install the UVC driver bundle. It’s standard on Win8 and later, but an add-on for Win7.
I’ve packed them up and placed it here: https://drive.google.com/open?id=1LZFntBE1wyIVT2zgKR7cW4XmZGTJydJt
If that doesn’t work, or you’re having issues with Win10, you might need a Media Feature Pack, available here: https://www.microsoft.com/en-us/download/details.aspx?id=16546