go to start > control panel > programs and features > rightclick on Nvidia Physx and select uninstall.
After that, install the latest physx software from NVIDIA: http://www.nvidia.co.uk/object/physx-9.12.0213-driver-uk.html

Usually, uninstall and reinstall of that package only fixes most physx issues. If it still does not work, try reinstalling the driver again, after you uninstalled physx.

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