Game seems to be picky about what system it's running on. I never had a problem with my copy. Hope you do get to run it, as I think it's one of the best games I've ever played, and a nice change to shooters.
Can't wait for the patch, I'll be playing it again, 3rd time.
*I also found the boxing to be easy. As Barfor said, you just wait until the opponent is about to punch - watch the arms - and then you punch them. Blocks their punch and you get a hit in. Works every time*