I have noticed that drivers will get corrupt easily so what I do if something like this happens is, defrag my machine, uninstall the video and audio drivers, uninstall the PhysX drivers as well, restart in safe mode, run ccleaner to get rid of any driver instances on my registry, restart once more in full mode and run a new clean install of video and audio drivers with full admin rights.
Remember, just because you are the admin of your pc does not necessarily means you are running with high or elevated admin rights. Go to the file where you donwloaded or have your drivers, right click on the file and use "Run as Administrator".
Also, make sure you have the latest patch for the game.
P.S.: This is what I do... your miles may vary