I've had a similar problem In the past with Call of Duty : Black Ops. There was one update, for about a month that no matter what I did, I would boot up Black Ops (In pristine condition I may add) and It would freeze on the introduction. So I waited It out until the next update, and that solved the problem. I'm afraid you may have to wait for another update before you can play again. It's a extremely rare error and there's little to nothing you can do about it