As the title says, I've tried everything but using the actual CD since I have the OEM version. I tried a repair CD but when It loads up it gives me an I/O error saying my CD drive or harddisk may be damaged, which I highly doubt. I checked all my hardware did ATI tests on the vid card and checked temps on CPU and everything is working fine. I want to know if there is a way to fix this without reinstalling vista, I'm on the XP partition of the system which seems to be working atm. Any help is appreciated.