Ragnaroots

So , as said in the title my ARMA 2 doesn't launch and neither does my OA , whenever i launched them i would see the bohemia interactive screen and then it would go to my desktop and say ARMA2(OA) stopped working, i can run OA by using the exe in the folder but , when i try the same with Arma 2 it says i have a bad serial key.. i have even bought a new digital steam version of ARMA 2 because my disc one wouldn't update properly.. might have to try updating disc version on other computer or something , i have tried to delete the registry files , re-installing, verifying game caches, i am running out of options , and running out of hope, pleas help me someone... any options you guys have for me are apreciated !!! Thanks Roots!!!