I was tweaking the properties of my Windows XP desktop. I want the icons to be large and the screen to be used to it's fullest extent when a computer game is loaded. I changed the appearance to 600x800 with large fonts. Now my desktop is very small and centered in the middle of the screen. I tried to change it back, but now my "OKAY, Cancel, and APPLY" buttons as well as the screen resolution slider bar are so far down on the window that I can't get to them. HELP!