The game does not need a key if you brought it on Steam, if you get an error message about that the problem is either in your account or in a license file on your computer.
Try this:
It's not asking for registry key anymore but the game still not lauching it start then close it self
It's probably a technical problem now.
Please create a DxDiag in text file format and post it with your next reply. You can do that with the "Choose file" button at the bottom right corner of the reply window.
(cm edit updated title - no further changes)
