This is not a dark problem. It's a problem with WIN7. You won't play all the games in full screen.You first open the Registry Editor.Find [HKEY_LOCAL_MACHINE\SYSTEM\Contro1Set001\Control\GraphicsDrivers\Configuration\〕Left click Configuration and select [Search].Enter: [scaling], find the parameters of [scaling] in the specific display device, and change them from the default [4] or [255] to [3]