heres a link for the latest drivers for GeForce cards

http://www.nvidia.com/object/winvista_x86_182.50_whql.html

i believe if you have a series 8 or above you can get special drives that let you use the unused processing power as a phyxs card

you lost me there.

well basically geforce series 8 and above had lots of extra processor power that was not getting used, so nvidia decided to use that processing to do the same as a physX card, find out about a the physX card here http://www.nvidia.com/object/nvidia_physx.html

not all game support a physX card but i believe Mirrors edge, UT3, Lost Planet and a hand full of other can utilise it. and alot have mods/addons that can use it aswell