I bet you used to have an ATI card, no?
If you dont clean every last bit of the competing drivers off your system youll see problems like you have here. If its not too big of a deal, I would format and reinstall windows. I do that every few months anyway.
"Who is General Failure, and why is he reading my drive?"
P4 3.0 HT, Intel D865GBF, 512MB Crucial PC3200 DDR, WD 36GB Raptor 10,000RPM, BBA Radeon 9800PRO, SB Audigy, Hauppage WinTV