You've probably already done this, but just to be sure have you tried re-installing the driver using a recent download from the Rega site? The relevant link appears to be as follows:
http://www.rega.co.uk/uploads/documents/xmos-stereo-usb-audio-class2-driver-2022(v2.15).zip
Once downloaded, you would have to extract the .exe file that is contained within the .zip (which can be done with the Windows file manager), and then run the .exe file.
Regards,
-- Al
http://www.rega.co.uk/uploads/documents/xmos-stereo-usb-audio-class2-driver-2022(v2.15).zip
Once downloaded, you would have to extract the .exe file that is contained within the .zip (which can be done with the Windows file manager), and then run the .exe file.
Regards,
-- Al