this man is right who said Service Pack 3 caused this, I had the SAME issue! one day im playing WoW and bam! my whole setup froze both dual monitors were garbaled with lines and chaos!!! lol I rebooted and my bios image and characters were the same as everyone stated here... im like this aint good... had to take the card out, put it back in booted into safe mode. (if it tried normally it would just shut my monitors off) uninstalled the drivers. rebooted again.
i did those steps 2-3 times before it actually went ungarbaled and back to normal with my bios!
reinstall nivida drivers within normal setup rebooted once again and it was all back to normal. and the last thing I did before all this was install SP3... curse you Service packs!~!!~!~!
i really thought my vid card was fried.