Scout for Hire

I literally JUST got arma 2 for this, got combined ops and everything. This is through steam, if it helps. First of all, I opted for the Dayz Commander method, first running Arma 2 and Arma 2 CO once each. Then, I downloaded installed Dayz Commander, using all the defaults on its part. Now, here's where the problem starts: When I try to install the latest Arma 2 version (through Dayz Commander), it says "Wrong CD key." Help?

Thanks. But, as it turned out, it wasn't set to launch through steam. Oh well thanks anyway :P