In this article we talk of copying the user profile.
In fact after a rejoin the domain or a link to a new domain, the existing user profile data is not there anymore.
Actually there are still only the data that Windows XP has created a new user profile is attributed to the different folders.
There are several methods for copying the user profile, Microsoft also features its own well described in various articles scattered throughout the Internet. But to copy the profile due to rejoin the same domain the best way to not have problems is the following:

1. Excluding the PC from the domain as part of a workgroup any. Reboot.
2. Log on as administrator user, then reinsert the machine domain. Reboot.
3. Access the domain with your username and password. Windows will run the first user's settings because the desktop will appear as classic.
4. Make the user administrator of the machine.
5. Restart and then log into safe mode (via F8)
6. Then log in as administrator in safe mode, locate the folders of the old profile present in "c:\documents and settings\old user" and copy the profile recreated from XP. Make sure you copy all files including hidden ones and see what good the old and the new profile, if not lose your files, in order to avoid this problem you can just see the files on the desktop of both profiles to realize .
7. Reboot normally and enter your user. At this point all your data and settings will reappear again without doing further work. Identified only drawback is that it must re-enter the password of your accout in Outlook Express.