I installed NT 4 server, and made a LAN network somehow got it working. I currently have the NT4 as the main server and XP as the part of it. But problem arised as I changed the domain and computer name and everything screwed up. I have no problem go into NT4 server comptuer using XP. But When I tried otherwise, the error occurs which says i have no trustrelationship between the XP and NT4. And I tried to establish one and it says domain controller not found. I got an answer from one guy. He siad that I should reinstall TCP/IP, then DNS, DHCP, and WINS services on the NT server that is my domain controller and configure them appropriately. How do I do that? p.s.1 will it help just format the harddisk and reinstall the NT4?