Cant play the game at all.

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Hello so i bought Arma 2 Co from Amazon it downloaded fine and when i go to play the normal Arma 2 it works fine i can play it. But when i go to play Arma 2 Oa it says bad serial number given in setup. Ive reinstalled the game about 10 times now i even called amazon to see if they know anything but they couldnt give me any help.And also if i try to run a update it says that i dont have the game installed which i know it is because i can see it and run it but it always crashes.(i cant buy from steam because somehow i got banned when i didnt hack anything) Thank you to anyone who can help me out

[-Gews- 7443]

http://dayzmod.com/forum/index.php?/topic/97180-the-complete-thread-about-serialcd-key-problems/

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http://dayzmod.com/f...d-key-problems/

yeah i have seen this and it was no help at all none of that worked