Xcsnine

When i start up dayz mod, a window pops up saying, "ArmA 2 OA Addon 'dayz_anim' requires addon' CA_dubbing_counterattack" Right after you close that window it starts up the actual game and it runs for about 15 seconds and then it crashes saying "bad serial number given in setup" Errorr Message. I tampered with the files in Arma 2:OA but i have no clue what i did because i forgot im pretty sure its the reason for making my DayZ fuck up. Is there some way i can wipe arma 2 completely from my computer and downloading a new copy of the game? Can someone please help me im fuckin desperate. Thank You

just dowloaded arma 2. whenever i look up in the sky in the game all i see is white. i already tried my video settings and couldnt work it out. kinda new to this so it would be nice if someone would help me out.