ArmA 2 OA crashing

Hey,

Iv bought the game 2 days ago, and strated to experience frequent crashes to desktop as i tried to play.

so iv come here for some help and suggestions.

The crashes, btw, seems to happen only when:

The crash includes: "The game Has stopped working" followed by close command.

-Clicking" Scenerios" button (most of the time)

-Playing the first mission in the compaign, sometimes crashes instantly, other around 2-3 min in gameplay.

-The game works perfectly in the Boot camp missions and didnt crash even once.

My PC includes:

-Inter core 2 Duo CPU E8400 3.00GHZ

-Memory : 2.00GB

-Windows 7 64x bit

-Graphic card Nvidia GeForce 9500GT

-DirectX 11

I ran the game with most of the settings on normal except:

AA: Low

Shadows: High

Memory usage: High

Iv also tried many performance tweaks posted here on the forums.

I would like to ask if there is any official solution to the crashing problems, as i see happens to alot of people as well?

Thanks In advance