error when i load up arrow head

[Viciouskidd33 0]

*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?:

i cant run it because the error pops up "Bad serial number given in setup"

*Which method are you using to launch the game? I.E Sixupdater/steam/batch file:

im launching from the steam option

*What is the Error/Problem you're having? Please provide screenshots if possible: when i open up combined ops i get a error saying "Bad serial number given in setup" and i have no idea what this means.

*Your PC specs:

honestly im not sure what a spec is

*Your Operating System:

windows?

*Have you looked at these threads?:

no

http://dayzmod.com/forum/showthread.php?tid=18588

[Remix (DayZ) 14]

Hey mate,

You need:

- The Arma 2 beta patch

- Launch from Six Launcher

Have a read of the threads that you haven't read yet, they will help you.

Cheers.

Edit: How'd you hear about DayZ by the way?