Still not working, it doesn't install. With SHIFT pressed, I restarted Win10x64, selected advanced restart, option DISABLE DRIVER SIGNATURE ENFORCEMENT (KEY 7), replaced original installation inf with modded inf 378.92 from here and installer gives me an error and is not installing at all. I downloaded the original ENGLISH US driver package for my model win10x64 GTX660M so I don't understand what's wrong...I need to uninstall old version 378.78 first? before installing last version? HELP!