Screen Flickers When Playing Arma 2

Sometimes when i'm playing arma 2 operation arrowhead the screen will go really fuzzy and start flickering and then there is constant flashes of light that look like lightining bolts inside my screen. Even when i exit the game it still continues and i have to restart the computer to get it back to normal. I have only played the game a couple of times and every single time this happens within at most an hour but once it happened just 5 mins into playing. What could be the cause of this and how can i fix it? I have never had this problem playing bad company 2.