Activate Screen Saver
User Configuration\Administrative Templates\Control Panel\Display
Enables desktop screen savers.
If you disable this policy, screen savers cannot run. This policy also disables the Screen Saver section of the Screen Saver tab in Display in Control Panel. As a result, users cannot change their screen saver options.
If you do not configure this policy, it has no effect on the system.
If you enable this policy, a screen saver will run if the following two condtions are true: First, a valid screensaver on the client is specified via the Screen saver executable name policy setting or through Control Panel on the client computer. Second, the screensaver timeout is set to a nonzero value via the policy setting or through Control Panel.