I Am A Potato

Hello I have just bought Arma 2: CO from Steam mainly for the DayZ mod I have been trying to get it up and running for the past 3 days but i just cant figuire it out I started asking around and came up with that I need to install the latest Build so I attempted to do so. Every time I Extract it reaches 100% and an error messages appears saying "Wrong CD Key" Please respond as soon as you find a fix. Thank you for you Time :D *Which version of the game did you purchase? STEAM or RETAIL or MIXED: Steam *Are you running an Arma 2 OA beta patch? If so what version?: Not Sure *Which method are you using to launch the game? I.E Sixupdater/steam/batch file: Six Updater *What is the Error/Problem you're having? Please provide screenshots if possible: Arma 2 _AO_Build_94444 "Wrong CD Key" *Your PC specs: Enough. *Your Operating System: Win 7 *Have you looked at these threads?: Yes http://dayzmod.com/forum/showthread.php?tid=18588 SteamGamers.com Servers: US89 Reg + US90 Reg + US91 Veteran 3rd Pers + US92 Veteran