You should probably have installed FrontPage 2003 before installing Office 2010, so that any shared components would update to the latest versions. Try reinstalling Office 2010 from the installation media. If that doesn't work, you'll probably need to uninstall both, then clean out any Office 2003 residue (see http://support.microsoft.com/kb/290301) before reinstalling FrontPage 2003 then Office 2010.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]