G'day, I am doing this as a last resort, I have spent a few hours scanning through google search for solutions on my problem but I have had no luck at all. So here it goes... When I click to start up the ARMA II OA expansion I get the usual loading bar with the last two boxes unticked, leading into a black screen and my mouse cursor with the loading icon. However, after a couple seconds it exits and I get the "ARMA II has stopped working..." pop-up with no solution to the problem or any explanation. I have noticed this started to happen since I decided to switch back to playing DayZ after playing 'Invasion 1944' for a while. Upon disabling Invasion 1944 and trying to fire DayZ back up in DayZ Commander, it required a few updates that I missed out on. Whilst I was updating DayZ, I decided to also download 'DayZ Origins' via Commander to try it out. This is when the problem began, and I followed a few steps to see if it could be fixed as follows: -Restart the computer -Run DayZ and Arma II OA as administrator -Strip Arma II of DayZ mod -Strip Arma II of all mods including Community Base Addons -Re-install Arma II OA and play with no mods Please note that I did NOT get this game through STEAM, I bought the Combined Operations pack from a store and downloaded it from the disc. So I could not do the 'verify integrity' option via Steam. None of these methods seemed to work, the interesting thing I noted though was that the old Arma II worked. It seems the problem is in the OA expansion. Most of the troubleshooting topics I have seen involve using Steam to some extent. What should I do? Thanks for your time, Rob