the best idea is to do this, ensure that the enableLocalPhysXCore is only in the Software AGEIA Folder, theres a folder under that wow6432 thing also named AGEIA I wouldnt touch it but heres what you should do, uninstall your driver for the physics, install the newest one only not anything else...
then go into the regedit, go to the AGIEA under software and add the enableLocalPhysXCore with your mac address...
that should get it working otherwise I wouldnt know but the key thing is not to install over old drivers, install over the highest new one and ensure that enableLocalPhysXCore is only found in the Software/AGEIA folder not the other sub root...
best of luck
