For a start I upgraded from 3 GB's of R.A.M (Random Accessible Memory) to 6 GB's of R.A.M and I had windows 7 ultimate x86 but this couldn't handle 6 GB's of R.A.M so I did a fresh installation to windows 7 ultimate x64 bit and I installed all my GPU drivers that were needed (NOTE: My gpu is powerful enough for the PC It's a Geforce gt 520 2gb's GDDR3) and then Installed a new cpu fan (push pins, most annoying things to install) and everything was fine, and then I decided I'll upgrade from VGA to DVI and the next day my pc just suddenly went crazy my CPU was running at 100% all the time so I scanned for malware with a bunch of virus program's and still nothing, everything I try to do is just painfully slow I can't run anything not even something simple as Facebook game's, I would be so grateful if anyone could help fix this problem