NVIDIA has released WHQL-certified GeForce 196.21 drivers for Windows XP, Vista and 7. You can find the drivers over here, below is changelog:
Adds SLI and multi-GPU support for many top new gaming titles including Avatar Demo, Battlefield: Bad Company 2, City Bus Simulator, Dirt 2, Ferrari Virtual Race, GREED: Black Border, Mass Effect 2, Mortal Online, Ninja Blade, Operation Flashpoint: Dragon Rising Demo, Planet 51, RUSE, Serious Sam HD, and Wings of Prey.
Upgrades PhysX System Software to version 9.09.1112.
Includes numerous bug fixes. Refer to the release notes on the documentation tab for information about the key bug fixes in this release.