Basically i quit xbox for some time and during that time i let my brother play on my xbox live profile when he ran out of live (rather foolish of me), He got me into an 11th prestige lobby, and now every time i load up the game it comes up the corrupt data error. I have been reset to rank 1 0 prestige, and then 10th 65, but when i go in an online game get some xp then leave it stays the same but the next time i load up the game i get the same error message and i go back to being 11th.