Did you install Win 8 as an upgrade, or as a fresh install, along with reinstalling Office? If you only did an upgrade, it's likely to have not fixed any problems with Office that the addins were causing. For that, you'd need to repair the Office installation (via Programs & Features > Microsoft Office > Change in the Windows Control Panel).
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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