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If you notice that your Windows desktop slideshow under Windows 10/8/7, which was working well, no longer works, you should read this article.
The Windows slideshow function does not work
First make sure that no software installed prevents background images from being modified. Also make sure your version of Windows 7 has this feature.
Windows Starter and Windows Home Basic do not allow to change the desktop background image and therefore the slideshow function, so you must confirm it ! But there is surely also the possibility to change your wallpaper in Windows Starter and Basic Edition !
Have done so, click the power icon in your notification area and select More Power Options. This opens the Control Panel, Power Options applet.
Now from your current/selected plan, click Change plan settings , then Change advanced power settings.
Next, in Advanced settings, expand Desktop background settings then Slideshow.
In the drop-down menu for each option, make sure the appropriate options are enabled.
See this message if you cannot change the desktop background image or if you cannot set an image as the background image.