I have a Sony VAIO VGN-AR61MR laptop with an NVIDIA 8400M GT video card.
It has Windows 7 (originally Windows Vista was installed)
Few weeks ago video acceleration stopped to work. Its video is recognized as VGA. When I install NVIDIA drivers downloaded from NVIDIA website it tells me there is no compatible hardware.
All 3D apps stopped to work. I tried many things except a Windows re-install. It would be hard to get all software installed back.
I was able to install driver from Sony UK website. There is Vista 32-bit and it worked on Windows 7 32-bit as well. It improved the performance but I am still willing to install original NVIDIA drivers. They do not install with the same error.