Driver Sweeper is a handy utility to remove traces of the drivers that uninstallers leave behind. I did not know about it until a guy from PowerColor tech support pointed it out. Even when re-installing new version of the driver it may be handy to run this utility to remove all files from the old driver. Turned out that NVidia uninstaller leaves a lot of things behind. This utility is currently maintained so it should be safe to use.