If the option to redirect the target folder for My Documents you may be able to modify the registry to fix it. If you are on a network with a policy enabled, your change may be overridden by a domain policy.
Use regedit an delete the following value:
DisablePersonalDirChange
from
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion [...]
One thing to check if a PC loses its domain association is the computer name. It two PCs have the same computer name the last PC to join the domain will stay connected or associated with the domain and replace the other PC with the same name. Unfortunately you will not receive an error if [...]
To move a Profile from one user to another or from one Domain to another you can perform the following steps. These are helpful when changing users, when profiles corrupt or when changing Servers and/or Domain controllers.
Login as original domain user, verify the profile directory under Documents and Settings
Join the MSHOME workgroup and restart
Join the [...]