well here's my situation. my computer used to freeze a lot so i thought it was some kind of virus, I then reformatted my computer and reinstalled windows xp. I later find out that the cause of the problem was with the graphic card drivers. When ever i install my graphic card driver it begans to freeze and not work. when i uninstall them it works better it doesnt freeze but it goes a little slower. i have always used the same drivers and i dont know whats wrong now. my graphic card is nvidia geforce 5500 128 mb
get a new gfx card, you can use an upgrade anyways =] you could always use the default windows drivers for the card, you might loose a little, not to much though.
have you tried using different drivers from nvidia? I assuming you are using the drivers that came the video card?
if i try to get the geforce 9800 id rather buy a new computer id have to change all my parts lol but unfortunetly i cannot afford it i installed vista and i have the same problem so i just disabled my card and its ok i guess