Screen Saver May Not Start in Windows XP
http://support.microsoft.com/default...b;en-us;326719

Troubleshooting Screen Saver Issues in XP
http://www.kellys-korner-xp.com/xp_s.htm#ss

Posting from another user by the name of David:
”I figured out what the problem is. It's the Microsoft Wireless Mouse. If I switch
the mouse to one with a tail the screensaver works.”
then David posted again
”I got a fix. I changed to connection to the computer using the USB to PS2 adapter
that came with the mouse. Now I get the screensaver. I would be interested to find
out why this works.”

"Philo" <Philo@discussions.microsoft.com> wrote in message
news:54A5BBA9-4961-4873-BD82-C2D6B00B043C@microsoft.com...
> Despite following instructions to enable a screen saver, the screen saver
> does not commence after nominated time has elapsed