Cellophanetacos

I recently purchased Arma 2 and Arma 2 OA on Amazon. I can't play multiplayer either, as i get the "bad version, server rejected connection" message. You say that the two have to be in the same folder: one of mine is in program files (x86), that's OA, and Arma 2 is in program files. Could this be causing the problem? when i attempted to patch OA and opened it, the lower right corner said 1.52.7etc. Every server, other than host my own, has a red X next to it. What does this mean? Under expansions, most say that they also have british armed forces (lite) and pmc (lite)....what does this all mean? Sorry to put so much in here. Help would be greatly appreciated!