well its been a few days that all of a sudden (after I installed FIFA 12 Demo) all the games seem to crash graphics when I run them. I either get a black screen or thrown to desktop with a 'Display driver has crashed' message or even a BSOD with nvlddmkm.sys crash message. it's kinda annoying I cant play any game on this computer, and I dont know what to do. I run Windows 7 64bit with 4GB Ram and my GPU card is GeForce 9800GT, I also use the latest driver for it. please if anyone knows anything that could fix this I'd appreciate it a lot!