nVidia has released ForceWare Release 163.11 beta drivers for Windows Vista

Notes:

Beta driver release.
This driver supports single GPU and NVIDIA SLI™ technology on DirectX 9, DirectX 10, and OpenGL for GeForce 8 series GPUs.
Improved compatibility for World in Conflict.
Numerous game and application compatibility fixes. Please read the release notes for more information on product support, feature limitations, driver fixes and known compatibility issues.
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Download for 32-bit
Download for 64-bit