You can download them at NVIDIA's website.
WHQL driver for GeForce FX, 6, 7, and 8 series GPUs. Improved compatibility and performance for NVIDIA SLI technology on Microsoft DirectX 9.0c and OpenGL 2.1 applications. Improved compatibility for game titles: BioShock, Crysis, Enemy Territory: Quake Wars, Hellgate: London, Team Fortress 2, and World in Conflict. Added PureVideo HD decode acceleration for GeForce 8600, 8500 and 8400 series GPUs. Numerous game and application compatibility fixes. Please read the release notes for more information on product support, features, driver fixes and known compatibility issues.