Alright, the next thing you may try is removing your Nvidia PhysX installation, then reinstalling it again via this link:
http://www.nvidia.com/object/physx-9.13.1220-driver.html
The PhysX software can sometimes become corrupted. You can remove the software through your Windows Control Panel with the "Programs and Features" application.
It is important you remove the existing installation first. Otherwise you'll receive an error that there is a newer version already installed, or the installation remains corrupted.