Error opening Excel Attachment in Outlook 2000

I have a user using Outlook 2000.   When trying to open an Excel attachment, it gives the following sequence of error messages:

File not loaded Completely

Downgrading Impcat on Goodwill.doc:file format is not valid
Reconcilation of file format is invalid.

It will give these messages with the only difference being that the file name in Downgrading part has changed.   It is almost as if it is referencing all previous attachments.

In the background it looks as if his .pst file is being opened in Excel.   The document eventually opens but it has all those others errors as well.    Any ideas before I try to just uninstall and reinstall Office?
eberganosAsked:
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