You could try repairing the Office installation (via Start > Windows Control Panel > Programs > Programs & Features > Microsoft Office (version) > Change), but your description suggests the problem might just as easily be with Windows. Either that or you're trying to save the attachments to a location you don't have write permissions for with the account you're using. You might also try clearing out the Temp folder (See 'Orphaned Temporary Files - Applies to all versions' at: http://www.gmayor.com/what_to_do_when_word_crashes.htm)

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]