Taking Ownership problem

A user had some files on a Windows 2000 file server that they had set to deny

access to everyone. To fix it, I took ownership of the folder and its

contents. Although she had assured me she was out of the folder, she in fact

had two files open. Those two files are no longer available to anyone. When

I go into permissions, it tells me that I do not have access but that I can

take ownership. When I go to the ownership tab, however, there is no edit

button so I can take ownership. I tried restoring from backup but the

permissions did not restore. Is there another way to take ownership of these

two files?

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Bettie