Nvidia's latest driver pack for Windows XP/2K adds support for high definition H.264 hardware decode acceleration on GeForce 6 and 7 series GPUs. Release Highlights:

Adds support for GeForce 7300 GS and GeForce 7300 LE GPUs.
New NVIDIA PureVideo features and enhancements. Please visit the NVIDIA PureVideo website for more information on PureVideo technology and system requirements.
Support for high definition H.264 hardware decode acceleration on GeForce 6 and 7 series GPUs.
Support for high definition MPEG-2 inverse telecine.
Support for high definition MPEG-2 spatial temporal de-interlacing.
Adds mixed vendor support for NVIDIA SLI.
TV-Out/HD-out support for NVIDIA SLI.
Added support for VSync on Direct3D games when running NVIDIA SLI.
Microsoft DirectX 9.0c and OpenGL 2.0 support
For a full list of fixed and known issues please view the Release Notes.

Full release notes for ForceWare v81.84 can be downloaded here.

Download the new drivers here.