Re: Bad Video card?????
Open the case and clean all the dust. Make sure that all of the heatsinks (cpu and vid card) are on their place, and make sure that all of the fans are spinning.
Or then if these doesn't help u could try flashing a new bios to the vid card, but I don't think this will solve the problems since if the bios would be messed up it wouldn't have started freezing, it would have stopped working immediately.