After uninstalling Office 2000, be sure to run the erasers for CD's 1 and 2. They clean up any residual leftovers in the Registry.

CD #1 - http://support.microsoft.com/directory/article.asp?ID=KB;EN-US;q239938

CD #2 - http://support.microsoft.com/directory/article.asp?ID=KB;EN-US;q247674