CANNOT CONNECT TO SERVERS

[kills2die4 0]

hi! i have both arma 2 games on my steam, the latest version of six updater, and it seems to be ok, i open up six updater and it gives me a option of joining different servers or quickplay, either one i click on it loads for a few seconds then sends me this ;

Cannot open file 'c:\program files

(x86)\steam\steamapps\common\arma2/addons/ca.pbo'

can someone help? D:

[Soldier of Failure 14]

Try launching Arma 2 CO via steam. That may allow you too join severs.