Try a different driver. The problem is that there basically isn't a stabe driver for the DX10 cards yet, period. Nvidia was in a rush to get them out and beat ATI, but I think in the end it may hurt them, the drivers are so problematic.
I was using the driver off the cd before I decided to update to new ones today to see if that fixed the problem, so older drivers don't work either. I'm just going to assume this isn't a driver problem and has to be something else since 2 different drivers (stable and unstable) did not work... The drivers off the cd were the only ones I could use for pets, already had the driver issues with that ep...