Excuse me if this is a naive question, but why isn't my preorder code working? I've tried two different real codes, but it says both are invalid or have already been entered, but I swear I haven't entered them. I'm trying to get the codes for my 360, could that be the issue? I called the gamestop where I bought the game and they just told me to call microsoft, which I'm sure won't solve anything. If anyone can help that would be great.