We have a number of xp professional pcs which log on to our network through a win 2000 domain controller. We rebuilt the domain controller - same IP, same network name, same everything, but the pcs won't recognise it until you force it to rejoin the network (network wizard or go to workgroup, then back to network). Problem is, when I do that, the user's profile is recreated. Eg, the folder "username" in documents and settings is no longer theirs, they start using "username.networkname" instead. The profiles contain all their emails, so we're talking up to 20GB per user, which is a lot of data to copy across every time. Is there a way I can force them to see the domain controller without having to go through all this? I've tried just adding the computer name into the list of computers on the server itself but no joy. We use active directory on the server, if that helps (or hinders!!). Thanks for your help!