Chaosplayer4

Hee Guys, After playing dayZ today and meeting a kindly hacker that teleported us into the ocean and spawned us all kind of difference weapons I started to have the problem: Bad serial key, this is a error when i start up my game ( Arma II Operation Arrowhead. ) Have been trying to re-install the game in steam. Also when I check in the regedit, under Arma II: OA i can't find the key or any date. my Arma II still got all data saved. Does any one know how i can fix the problem? - Chaos