If you haven't tried Help Detect and Repair in Excel 2000, it would
be worth a go. If that doesn't work, read on.

I have encountered problems with MS Query on systems with more than one
Office version installed. Did you install Office 2000 before adding
Outlook 2003? If not, I suggest removing Office 2003 and Office 2000
and starting again, installing 2000 first, checking that MS Query runs
OK, and then install Outlook 2003.

Bill Manville
MVP - Microsoft Excel, Oxford, England