I think so... Microsoft has some articles of how to properly do this. Haven't done this stuff for a while now (no AD to play with now )

Anyways, make sure you're using the new Group Policy Management tool which will disable the built-in GPO edit you would normally see. Then there is information about how/why changes need to be done on the Server 2000 since it does not have/understand the newer values that will show on XP.

Sorry, but you'll have to do some Googling for the links yourself.