Two user folders under documents and settings

Currently I have a terminal server setup on windows 2003 server. Recently I have had 2-3 users login and it creates a new user for them under documents and settings that has the domain suffixed. I tried to delete the old user directory (without the domain suffix), but it says ntuser.dat is in use. Does anyone know why it has created a duplicate user folder and why is the old user directory still in use?

It creates a new one when it can't access the old one - if the permissions are wrong, for instance, and if it can't make a new one with the same name then it adds .DOMAIN to the end.

The old ones are almost always in use because of Windows keeping the user's registry settings loaded, and a reboot is needed to clear them.

Quite why you, specifically, have 2-3 users who had profiles and now suddenly have new ones, doesn't make sense with the information you have given. Has anything changed on the server since they last logged in?