GFWL saying I have already used my key but I havent?! (Just got Halo 2 for Windows Vista literally 3 hours ago, had trouble installing it and now this?!?!) It says this exactly: "Can't sign in because your product key is not valid. Please enter a valid product key.". I just bought this game off of amazon last night, so it wasn't torrented or anything.
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I would suggest you get your money back and get something else. If you are clueless about what else to get, I suggest something in the Tom Clancy series.