These pictures are 800 pixels wide, making them suitable to fill a screen set to a resolution of 800 width. They are designed for use as wallpaper on your Windows "desktop" (behind the icons). When looking at the picture you like best, back-click*** on that picture and then choose "Set As Wallpaper." That's all you need to do.
*** This is often called right-click however, when you use a "left-handed mouse (as I do at home), you need to left-click. That's why the term back-click is better. New! (July 4, 2001) 2 B-1B's in view at Great Bend, Kansas