I recently migrated our DC from 2K server to 2003 Server, now I have a few PC's that are giving me connection issues. Periodically, when they try to log in and access their mapped drives or printers, they get the error message that security has been compromised. When I try to log them in, XP tells me that a Domain Controller cannot be found. If I take the machines out of the domain, I can access the mapped drives and printers on the server. All users are currently set up as Domain Users, Domain Admins, Enterprise Admins, Schema Admins and Group Policy Creators/Owners. I would like to return them to just Domain Users once the connection issues are resolved. No error messages appear on the server at any time.