Hello, I've got the same problem with the return to the desktop after 5-10 mn of game or sometime I can just go to the menu and when I choose Scenario for example, the game return to my desktop with an error message that arma2OA.exe have a problem and it must be closed. I have win7 32b enterprise, Nvidia GForce 9800 with the latest driver my arma version is 1.59.
Sorry for my bad english ^^
Regards