HKCU\Control Panel\Screen Saver.<Screensaver-name>
Each <element-name> entry represents an element of the screen saver that can be altered by the user.
To change the screen saver elements, double-click Display in Control Panel. Click the Screen Saver tab, and then click the Settings button.
Note
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.