Adding a NT 4 global account onto a Win2

Trying to add a user from an NT 4 domain into the local adminsitrator group on a Wondows 2000 Pro machine is extremely slow! When I try to add a user from the Domain, logged in locally or on the Domain it seems to generate 20 users every 2 minutes.If your last name starts with W and I have over 8000 users…well you get the point. Any feed back is appreciated, thanks.