One of the changes in Themes in Win 7 is that it has this option to have multiple backgrounds that gets looped around.
As you can see in the personalization screen, there are some themes that have multiple screen backgrounds. When you choose one of these themes, the desktop background loops thru these pictures.
There is also this option in the desktop right click menu that will allow you to change the desktop picture.
If you don't want to change your theme, you can go to and change your desktop background setting to do the same.
You can also change the time setting and also the order in which the pictures are chosen in this screen.
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