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http://www.winguides.com/registry/display.php/1190/
Restrict the Screensaver
or you could do it this way:
http://www.winguides.com/registry/display.php/170/
Hide the Screen Saver Settings Page
and how to do what was done for screensavers in the above link can also be done for the display background tab:
http://www.winguides.com/registry/display.php/169/
Hide the Display Background Page