HKCU\Control Panel\Screen Saver. Screensaver-name
Each element-name entry represents an element of the screen saver that the user can alter.
To change the screen saver elements, double-click Display in Control Panel. Click the Screen Saver tab, and then click Settings.
The element-name entry is a variable representing the entries under the HKCU\Control Panel\Screen Saver. Screensaver-name subkey. It does not actually appear in the registry. This variable entry displays information that is common to the entries in the Screen Saver. Screensaver-name subkey.