DayZ in game settings keep resetting

[Bonzer 0]

It's happened twice now, it gives me an error message "No entry'C:\Users\Admin\Documents\ArmA2\ArmA2OA.cfg.3D_Performance'." and then in game its as if I've never changed any settings to graphics, keybinds, etc. and I can't get the UI back to normal size. Any help?

Edited March 25, 2013 by Bonzer