This policy setting allows you to manage whether or not screen savers run. If the Screen Saver setting is disabled screen savers do not run and the screen saver section of the Screen Saver tab in Display in Control Panel is disabled. If this setting is enabled a screen saver will run if the following two conditions are met: first, that a valid screen saver is specified on the client via the Screen Saver Executable Name group policy setting or Control Panel on the client. Second, the screensaver timeout is set to a value greater than zero via the Screen Saver Timeout group policy setting or Control Panel on the client. This policy setting allows you to manage whether or not screen savers run.

[enable/disable]

(1) GPO: User Configuration\Administrative Templates\Control Panel\Personalization!Enable Screen saver (2) REG: HKEY_USERS\Software\Policies\Microsoft\Windows\Control Panel\Desktop!ScreenSaveActive