Board Thread:Questions and Answers/@comment-188.181.180.130-20130202165316/@comment-25050905-20141115072621

For Steam users, there might be a problem with the recent patches interfering with the game files. What I did was go to Properties > Local Files > Verify Integrity of Game Cache... Steam later said there were 272 files missing, and proceeded to download 10.5GB of files (Ouch). Anyway, try the mthod which I had used, maybe Steam can help you with this problem.