Prevent changing screen saver

Supported on: At least Windows 2000

Registry

HKCU Software\Microsoft\Windows\CurrentVersion\Policies\System

Value name: NoDispScrSavPage

Description

Prevents the Screen Saver dialog from opening in the Personalization or Display Control Panel. This setting prevents users from using Control Panel to add, configure, or change the screen saver on the computer. It does not prevent a screen saver from running.