DayZ Commander won't find Arma 2 Arma 2 OA

[Scryers 0]

Hello there people of the DayZ world! My name's Scryers and a few days ago my friend gifted me Arma 2 and Arma 2 OA. As I was most interested in playing DayZ, right after I downloaded the game,which was a few hours ago I tryed to install the mod.

 

Now what happened DayZ Commander doesn't find Arma 2 and Arma 2 OA on my computer and I also downloaded the game via Steam..I'd really need some help here as I was searching answers around Google but couldn't really get too much help.I launched both games atleast once as I thought maybe that would be the problem but no,still no luck. 

Sorry if I didn't post where I should've since I don't spend too much times on forums overall,also sorry for the my bad English,it's not my mother langauge :)

[Scryers 0]

Problem solved.