When you start Windows, you may be presented with the Windows XP welcome
screen, which prompts you click your user name to begin, or you may be
presented with a Welcome to Windows dialog box that prompts you to press
CTRL+ALT+DEL to log on. By default, if you do not press a key for 10
minutes, the Windows logon screen saver (Logon.scr) starts.
Hi Michael,
If you want to change the screen-saver at the logon screen, then type
REGEDIT at Start>Run.. and navigate to HKEY_USERS\.DEFAULT\Control
Panel\Desktop and on the right pane find the string named SCRNSAVE.EXE
Double click it and enter the full path to the screen-saver of your choice
and click OK.