NVIDIA ForceWare 77.77 Drivers
 

Support for GeForce 7800 GT
SLI support for GeForce 6600 and GeForce 6600 LE
New SLI rendering mode for increased antialiasing performance
Broader SLI optimizations and validation for the latest games
Resolved SLI Antialiasing issues with some applications and generating screen shots.
For a full list of other issues resolved, please view the driver release notes.
Microsoft® DirectX® 9.0c and OpenGL® 2.0 support

http://www.nvidia.com/object/winxp_2k_77.77.html