A slideshow of current image folders can be set as the desktop background by using the option "Change all images". The images are changed with a short crossfade by default. The time interval for replacing the individual images can be configured in the Registry. For this, type "regedit" in the Start menu, press the Enter key and click "Yes" on the User Account Control dialogue box. Once the Registry Editor opens, navigate to the key "HKEY_CURRENT_USER\Control Panel\Personalization\
Desktop Slideshow". Now click in the right side panel and generate the new entry "AnimationDuration" with the command "Edit | New | DWORDvalue".
Now open the new value with a double-click for editing. Change the base to "Decimal" and enter the desired duration in milliseconds. For example, a value of "0" will result in an immediate change without any animations and a value of "5000" will result in a smooth cross-fade animation. Confi rm your changes with "OK" and close the registry editor. The changes will be eff ective immediately.