nVidia has official released their ForceWare 53.03 for Windows 2000 and XP

Release Highlights:

* Increased graphics performance when using nForce3 systems.
* Improved HDTV Y Pr Pb component out support for 480i, 480p, 720p, and 1080i formats*
* Added support for GeForce 5900 XT
* Microsoft® DirectX® and OpenGL® support
* NVIDIA nView 3.0 Multi-display technology
* For a complete list of compatibility fixes please consult the v53.03 Release Notes

Download

New drivers for Windows 9x/ME are available here