My resolution on my computer screen is 800x600, you see this if you right click on your desktop, goto properties, and then settings. Now go into Aces High, and you see the clip board come up. Press the video button, you will now see the screen where you change the game to 800x600. I think if your computer monitor is set to something else, you should set Aces High video to match your computer screen to get this to work right.