Modify the values right there in the registry:
HKCU\Software\Policies\Microsoft\Windows\Control Panel\Desktop
ScreenSaveActive set to 1 for screensaver and 0 for no screensaver
ScreenSaveTimeOut is number of seconds before activating screensaver
SCRNSAVE.EXE is full path and file name of screensaver to use
group policies can override these settings (duh!) but at least it's easy to check the current values
Microsoft's info
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Update: the presence of this key means the screen saver tab is disabled (probably from a group policy)
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Restrict the Screen Saver (Windows 2000/XP)
This restriction can be used to specify the screen saver or to stop screen savers from running. Also, the Screen Saver settings page is disabled, so users cannot change the screen saver options.
Create a new DWORD value called "ScreenSaveActive" and set it to "0" to disable all screen savers.
Alternatively create a new string value called "SCRNSAVE.EXE" and set it to the executable name of a valid Windows screen saver file, including the .scr extension. This will only be used if "ScreenSaveActive" is set to "1" or deleted from the registry.
Restart Windows for the change to take effect.
more info
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( Windows Win2K )