Nvidia has released the Official Forceware 177.83 drivers for Windows XP 32-bit/64-bit and Windows Vista 32-bit/64-bit. These drivers are only for GeForce 8, 9 and 200 series graphics cards, and aside from several fixes,
they include full support for GPU-based PhysX on the above graphics cards, courtesy of the included 8.08.01 PhysX drivers which are part of this Forceware package.
To allow you to experiment with the new GPU-accelerated PhysX capabilities, Nvidia has also released the GeForce Power Pack, a set of games and tech demos which support PhysX and highlight its benefits. The pack also contains the full Unreal Tournament 3 PhysX Mod Pack, since UT3 supports additional PhysX-based levels which GeForce 8, 9 and 200 series owners can now access.
Force Within: Download