640 x 480 This size is common in many laptops.
800 x 600 This is standard resolution.
1024 x 768 Most 17" and 19" monitors use this size.
1280 x 1024 Used on large, high-resolution monitors.
HOW TO SET YOUR DESKTOP:
Click on the desired resolution and wait for the image to load. Then right-click your mouse, select "Save Image" to download it to your hard drive. Then right click on your desktop, select "Properties", and choose the "Background" tab to set your image.