Possible Duplicate:
Start screen saver the moment I lock the computer on Win XP
can screensaver run when the computer is locked?
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Start screen saver the moment I lock the computer on Win XP
can screensaver run when the computer is locked?
not sure you can change windows do to it but you could create a program that locks the computer and runs the screensaver?
To lock the computer:
System.Diagnostics.Process.Start("rundll32.exe user32.dll, LockWorkStation"); System.Diagnostics.Process.Start(@"c:\windows\System32\ribbons.scr");
http://wraithnath.blogspot.com/2010/09/lock-workstation-without-ctrl-alt-del.html
Make sure when you set your screensaver properties to display the logon screen on resume (at least I'm pretty sure that XP can do that).