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I recently bought Halo at BestBuy, everything has went well, until i tried joining a game.... it says invalid cd key or regrestation key or something like that???? what does that mean, how do i have a invalid cd?
Heyyo,Was the game used? if so, someone else could've been in the server using that key. Other than that? return your copy to bestbuy and say the cd key doesn't work and i'm sure they'll exchange copies with you.
try reinstaling, you may of typed you CD key wrong. sometimes it lets you through even if it's wrong