I just bought the game from Steam and finished installing it with no problem. I verified that the game's local isn't damaged. All my other games are working fine. The directx file for the game has also been installed.
The game doesn't launch. When I attempt to launch it, the computer thinks for awhile, but nothing happens. After about 10 seconds, the game syncs its data with Steam, which suggests that the game closed itself.
I am running on Win7 with an nVidia GeForce GT 540M (through nVidia Optimus).
You can download my DxDiag text file from: https://dl.dropbox.com/u/3066774/DxDiag.txt