NVIDIA published WHQL certified GeForce 186.18 drivers for Windows XP, Vista and 7. As always, you can download them over here.
Here's the changelog of the Windows Vista/7 driver:
Installs the new PhysX System Software version 9.09.0428.
Adds support for Ambient Occlusion – the newest NVIDIA Control Panel feature to offer enhanced 3D gaming realism exclusively to GeForce GPUs.
Adds support for CUDA 2.2 for improved performance in GPU Computing applications. See CUDA for more details.
Expands GPU hardware acceleration for the NVIDIA Video Encoding library to GPUs with less than 32 cores. Applications using this library include CyberLink PowerDirector 7, Nero Move it 1.5, Loilo SuperLoiloScope MARS, and CyberLink MediaShow Espresso.
Accelerates performance in several 3D applications. The following are examples of improvements measured with Release 185/186 drivers vs. Release 181 drivers (results will vary depending on your GPU, system configuration, and game settings):
Up to 25% performance increase in The Chronicles of Riddick: Assault on Dark Athena
Up to 22% performance increase in Crysis: Warhead with antialiasing enabled
Up to 11% performance increase in Fallout 3 with antialiasing enabled
Up to 14% performance increase in Far Cry 2
Up to 30% performance increase in Half-Life 2 engine games with 3-way and 4-way SLI
Up to 45% performance increase in Mirror’s Edge with antialiasing enabled