Robert Judge wrote:

When I run Office 2003 "Detect and Repair", I am prompted to provide
the source of the file "PRO11.MSI."

I point to the Office 2003 CD in the CD drive, but Outlook tells me it
cannot find the file.

That's usually a sign that the Office CD you have contains a different
version of Office (or at least Outlook) than is currently installed. You'll
get a similar message if, for example, you have Office 2003 Basic installed
and the CD contains Office 2003 Professional.
--
Brian Tillman