RambOFreAc

So.. yeah. I got dayz a few weeks ago. Never cheated, played on a server with cheaters, got killed by them with nuke and changed server. But today when i were going to play, it says "Bad serial given in setup". I have tried the solutions people are giving, except when i try to delete that ArmA 2 OA map in Bohemian Interactive Studio i cant. And people says "oh but just fix the permisson", but still, it doesnt work.. Reinstalled the game, the whole thing, dayz commander, but still says the same thing. So what is wrong? is it because some hackers fucked up a server that i played on? It was unofficial. Pls help me! The game was bought on steam!

i bought the game on steam