I've been trying to make Bioshock with with no success so far.
When I try to launch it via Steam a notification asking me to allow the program to run.
If select yes it says "failed to start game(app already running)", if no is selected, "failed to start(unknown error)"
I've tried to use -nointro, -dx9, etc. launch options, enabled "Stereo Mix", and tried all compatibility modes, but nothing worked.

My specs:
GTX 680
8 GB RAM
i7-2600k
Windows 8 64-bit