C: /windows/System32/ and delete all the Nvidia .dlls. I have 41 in my folder and I can't be bothered to list them.
I don't know which ones are Nvidia dlls, there are too many random named files and folders..
Have you tried to uninstall in safe mode? With DriverCleaner (in safe mode again)?
I have not tried anything in Safe mode, Maybe that could help. I was thinking about downloading Service Pack 1 again and reinstall it, maybe it will help in some way (refresh some system files or something) : /