Windows XP Tweaks

Change the Logon Screen Saver
Click Start , click Run , type regedt32 , and click OK .

Navigate to the following registry key:

HKEY_USERS\DEFAULT\Control Panel\Desktop

In the details pane (right-side), double-click the SCRNSAVE.EXE string value item.

In Value data , type the path and name of the screen saver, and then click OK .

IMPORTANT : Make sure that you specify the path correctly to the screen saver. If the screen saver is located in %SystemRoot%\System32, the explicit path is not required.

You have now changed the logon screen saver.