So after spending hours browsing the internet for a fix, and none of them working, i have had to come and ask here.
The issue im getting is while trying to run Arma 2 Combined operations i get the following error "This game is currently unavailable (Application running)
This only happens while running CO, Both Arma 2 and Arma 2 Operation Arrowhead work fine.
Steps so far:
Exited steam, restarted computer
Verified integrity of the Arma 2 OA and Arma 2 files.
Run Steam in admin mode
Run both Arma 2 and Arma 2 OA in admin mode
Tried steam beta
None of those worked.
the only reason i havent tried reinstalling is because of internet usage.