Office 2003 is a Windows version, and Office 98 is a Mac version.
Do you have a PC or a Mac (or do you not know the difference)?
A PC cannot not run a Mac version of Office, but a Mac can run
a Windows version of Office if you have VirtualPC installed on
the Mac. See http://support.microsoft.com/?kbid=828956
"Information about running multiple versions of Office with
Office 2003".
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