Click on the desired resolution and wait for the image to load. Then right-click your mouse, select "Set Wallpaper" to change your desktop picture immediately. Or select "Save Pictures As" to download it to your hard drive. Then right click on your desktop, select "Properties", and choose the "Background" tab to set your image.

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.