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When I Want To Play Online Or CO-OP It Says I Need To Register And I Say Okay Then I Write My Name And Okay Then It Says Notice If You want to play multiplayer and blah blah and returns me back to register Any Fix
Note : Mine Is Cracked Version
Your product key is invalid.
MW3 Multihack v1.2 by AuT03x3C
download updates from tbp and try the cracked servers.