If you encountered problems while playing the Mafia II demo on your PC, your salvation may be at hand. 2K Czech has released a patch through Steam that fixes one specific error.

"There was an outstanding Steam PhysX installation issue where PhysX/APEX settings on MED or HIGH will only be run on the CPU, drastically lowering performance," said 2K on their forums. "This has now been corrected – so if you experienced this problem yesterday, things should run a lot smoother for you today!"

The demo was released yesterday for the PC, PS3, and Xbox 360. It allows you to play a mission called "Buzz Saw" from the full game.