i need help as well :/ i am on a 64 bit windows 7, so i downloaded arma 2 and OA last night but now im ready to install but half way through arma 2 says "crc error" and so does OA but OA does it at like 99%. and i tried lookin at the takistan thing but it isn't the corrupt file he had. i dont know what to do lol i need help other wise i bought it for nothing and missing out on a good game, i downloaded it from amazon btw. please help D: