Windows XP A to Z - http://www.softwaretipsandtricks.com/windowsxp
Screensaver keeps resetting to NONE
http://www.softwaretipsandtricks.com/windowsxp/articles/167/1/Screensaver-keeps-resetting-to-NONE
Super Admin
 
By Super Admin
Published on 02/23/2005
 
To be able to set your own screensaver, follow the following instructions

Screensaver keeps resetting to NONE

Go to run and type gpedit.msc
Navigate through User Configuration>Admin Templates>Control Panel>Display
Double click Screensaver
Enabled and apply.
This should fix it.

NOTE: Group Policy Editor is only available in XP Professional