All files on pc show as being created/edited by a different user

I have a user with a Win7 laptop on a domain that let another user login to access email.  After that, all existing and newly created files will show as being owned and edit by the other user and not the owner.  This goes as far as to show that the files are locked for editing by the other user if someone on the network tries to open them up.
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hindsightAsked:
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Kash2nd Line EngineerCommented:
your question is a bit ambiguous to me.

Are you trying to say that laptop which is joined to domain is being used by another person on the domain to login and they access their emails using it.

What kind of user is the user in question ?
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hindsightAuthor Commented:
Yeah it was a bit confusing.  They are both domain users.  User A owns the laptop, user B popped on one day just to grab email, and now all of user A's files are showed as being owned by user B.  If someone opens a shared file in use over the network belonging to user A, it say that it is owned by user B.
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Kash2nd Line EngineerCommented:
this tells me that user B has got Admin Rights on their login and they may have tried to access User A's files by taking the ownership of the user folder of user A.

you can may be ask user A to login and look in effective permissions to see who is the owner of that particular folder.
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hindsightAuthor Commented:
User B does not have local admin rights.  It's not just documents...every files on the pc shows the wrong owner.  it's bizarre, never seen anything like it.
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Kash2nd Line EngineerCommented:
that is strange.

have you tried deleting the profile off that computer completely and logging back in on that computer.

also, does the same thing happen if user B logs on to some other computer ?
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hindsightAuthor Commented:
Haven't tried rebuilding.  User B has his own laptop so wouldn't logon elsewhere, just happened to be in that persons office without it.
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Kash2nd Line EngineerCommented:
hmm... it is very strange that logging in with a different account would change the owner permissions. Can you create a test account with same kind of permissions as user b and login to that particular laptop.

There may be some kind of corruption causing this so may be worth rebuilding the OS. just a suggestion.
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