Ive installed Arma with no problems. I go to run the game and the check boxes complete their load...then it gives me the "ArmA has encountered a problem and needs to close. We are sorry for the inconvenience."   I dont see why it would do that with no mods or anything, just the game out of the box...ive tried uninstalling and reinstalling, defragmenting and downloading new drivers and DirectX 9.0c   My processor is the only thing that might cause this game to lag, and the video card is the only one i believe would cause it not to work.  PC specs:
AMD Athlon 2800+ 2.0 Ghz
1.12 Gb RAM
Nvidia GeForce 6800