Have you tried repairing the Office installation? That said, Office 2007 is no longer supported, so upgrading would probably be a good idea, as in some respects the later versions are significantly better products.
There is generally little reason to use 64-bit Office and, depending what addins you use, potentially good reasons for not doing so. Not all addins are 64-bit compatible and the only real advantage with 64-bit Office is for working with exceptionally large Excel workbooks.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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