Slow login to W2k server from XP pro

When i am longin to W2k server from an XP pro client as a Domian user it will take long time to login.Tried from many new PC, same effect.
i have same problem in 3 different location(all servers are brand new with good memory).i don’t know whether it is problem of the way i am configuring the server. if i login from a Windows98 client to the same servers it will work pretty fast. pls give an answer. thanking u.