ForceWare Version 158.22
 

NVIDIA has released new ForceWare drivers today for Windows XP and Windows XP Media Center Edition. Along with support for the new 8800 Ultra, the new 158.22 drivers fix various game and application compatibility issues and also solves installation issues with previous driver packages. (src: HardOCP)

http://www.nvidia.com/object/winxp_2k_158.22.html