Logon

We are using Windows 2000 server with XP workstation. XP wks takes very long time (3-5 min.) to logon to the W2K server. I deleted & recreated the users profile, added new users and even installed another W3K server but do not see any improvement.

The environment is:
Windows 2000 with latest patches
Windows 2003 with lates patches (seperate LAN)
XP-SP2 with latest patches
Updated Antivirus

Can any one tell me what is the problem and how to fix it?