http://www.nvidia.com/object/winxp_2k_56.64 (For 2K/XP)
http://www.nvidia.com/object/win9x_56.64 (For Win9x/ME)
Release Highlights:

Adds support for GeForce 5700 and GeForce 5700 Ultra
Microsoft𦲷 DirectX𦲷 9 and OpenGL𦲷 1.5 support
Supports application profiles for custom image quality and performance modes for all of your applications and games.
NVIDIA nView 3.5 Multi-display technology
Advanced Microsoft𦲷 Internet Explorer𦲷 popup blocker
Industries only Display Gridlines technology
Improved HDTV Y Pr Pb component out support for 480i, 480p, 720p, and 1080i formats**
For a complete list of compatibility fixes please consult the v56.64 Release Notes below
* While this driver is not WHQL certified on TNT2, GeForce 256, GeForce2 GTS/Pro/Ti, and GeForce3 graphics boards, it will install and function correctly.

** HDTV Y Pr Pb component out requires compatible hardware. Please consult your graphics board manufacturer to find out if your product supports it.