Not really the place to ask that, but I'll try to help, and it's going to be the answer you don't want to hear... if it's a disc, do a Google search, it's a known issue and the solution is very time consuming, involving repeatedly quitting the game and removing the disc or something. There should be something coming up straight away outlining the full method. Edit: hmm, nothing came up easily, the method I heard was (I think) to download an update, quit game, remove disc, disable Internet connection, then install update. Not sure if it works, apologies if you try it and it doesn't, so try to do a little research first. Good luck either way.