Ok am trying to set a default screensaver for all users on win2000 pc's

We have active directory but none of us know how to use it properly (guy who set up profiles has now left company and we're attempting to fill in the gaps)

if you can tell me a way of doing it through the active directory that would be great (just make sure is basic) or if it has to be done locally at each machine thats ok as is only needed to be applied to 1 campaign (30 machines) so can run round and fire it on each fairly quickly