Why isn't my slideshow wallpaper changing?
Might only work when the computer is asleep. There's a
background; the wallpaper when your computer is active/when you're
doing something on it, and ten there's the screensaver; which is
the wallpaper when the computer is asleep. Make sure you have your
slideshow set to the one you want. Then there may be a timer for
how long after inactivity begins before your slideshow starts. You
should be able to find all of this information if you right click
on your wallpaper and hit personalize. By the way, most computers
don't allow a slideshow as your background, but only as a
screensaver.