If it is your only computer you could to make an image of the hard drive, wipe it and reinstall Windows + drivers and try again. If it is still not working you could let the remote support try to fix it as there is nothing sensitive on the computer. Make sure you watch what they are doing and take notes so you can do the same to your original system. When all is done you can restore the image back.
It is a complicated way around the problem...
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