Change the desktop cleanup frequency

Through Display Properties (Desktop tab, Customize Desktop button, General tab), you can turn on and off a feature that runs the Desktop Cleanup Wizard every 60 days. You don?t have an option to set a different interval there, but you can change the interval in the Registry. To do so, go to:

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerDesktopCleanupWiz

Change the Days Between Clean Up Value to some other number of days (in decimal format).

more:here