: Find the downloaded image on your computer, right-click it, and select "Set as desktop background" . Control Panel Method :
For a resolution, which is a common 16:10 aspect ratio , you can find a variety of Windows 7-themed and general wallpapers through dedicated galleries. Where to Download 1280x800 Wallpapers
Right-click an empty space on your desktop and choose . Click on Desktop Background at the bottom of the window.