Thanks for the information. I am also having an issue with NVIDIA Windows 7 drivers.
I'm using XFX 8500 GT (256 MB) card for the past 9 months with vista wihtout any problem. Last week I switched to Windows 7. After that also ,the display doesn't have any problem. But when watching movies, it looks pixelated. I installed the latest NVIDIA drivers also. Intel onboard graphics works properly with windows 7. I hope NVIDIA people will solve this also.