I guess it's a hardware issue for it works perfectly on a different computer with the same OS. It doesn't work at home on my gaming computer, but runs perfectly AT WORK in my crowded office :D :D :D (Just for your information the symptoms I had were the game closing instantly without loading, and a little "exclamation mark" logo apperaring for a millisecond. Updating the pilots of the graphic card, and debug mode didn't change anything. )