Okay so some of you may know that my computer isnt the best.. and as I've heard that windowed mode on Arma 2 reduces lag, I decided to try it out. However, the issue now is that the window is covering roughly 1/4 of my screen, and if I were to play DayZ in that size I'd be dead in seconds for not being able to see the enemy.
So what I'm asking here is, does anyone know how to change your resolution in windowed mode?