Originally Posted by
Barrzo
Hey guys. This is a first time post for me on these forums but came across this thread and though I would see if I could try and help out. Due to stupidity the exact same thing had happened to myself, was getting rather peed off with playing DayZ and continually getting f*cked by hackers. My logic of thinking was if you can't beat em join em. (fail on my part) Anyway to get to the point. What I had downloaded had turned out to be a keychanger! I own Arrma 2 OA through steam and from what I had read just starting your game through steam should automatically re-wright your reg key again. I tried this several times with no avail. I also tried deleting local files and re-installing again with no joy. I tried (as others are saying) to delete the key in the registry and it wouldn't allow it! So after trying many different things I went back to my registry and tried to delete the "ArmA 2 OA" folder that holds the Key file and yay it let me, I then started up Arma 2 OA in steam again and it re-wrote the original key back into the registry.
Its what worked for me and I hope it works for you
Good Luck
P.S. Although this may be a fix for now, in time i would imagine we will get CD-Key in use problems then eventually a global ban on the key =/