ARMA2 & OA's Steam Thread: All Steam Q's/discussions go here [covered by Dwarden]

[ARMA2 & OA's Steam Thread: All Steam Q's/discussions go here [covered by Dwarden]]

i recently bought arma 2 Combined Operations via steam. Operation aroowhead works fine but arma 2 gives me an error saying (Bad serial) or something like that. and it didnt even say for me to put one in during installation. please help

I am also having this problem! Can you please fix it. It reads "Bad serial given at setup"