new user profile is created and not use original user profile after logon

[Guest Guest]

Recently, some users didn't see their own desktop or files after logon. A

new profile was created after checked and will use new profile (e.g.

\username.000).

Then I need to rename \username.000 to \username.old and restore user's

original profile \username to \username.000

 

Actually, what can cause this problem or any solution to avoid this happen

again?