My monitor resolution is 1680 x 1050. However, after I play games like Stalker or call of duty 4, my monitor resolution changes to 600 x 800. And, when I try to change the resolution back to 1680 x 1050, the monitor just automatically reverts it back to 600 x 800. By the way, I have the latest video card drivers for my ASUS EAH3870 DDR4 512MB. Also, I have Windows vista home premium.