Hello, I have this problem too. The game loads up fine, to both menu and campaign, but in the latter case it just freezes on "Pumping Sim Once" and nothing happens from there. I suspect this may be due to some kind of feedback loop, but it may also be due to the fact my graphics card isn't anything fancy (or anything made by NVINDA for that matter). I bought the game from Direct Download and everything seems okay, except that it won't load.
Has anyone found a fix for Direct Download? If so, please tell me. The loading screen is pretty and all, but it gets old real fast when you're waiting for the five-year-awaited sequel to my favorite game ever.
First post! Yay.