Hi Tony,
You may be confusing MS Windows XP editions
(Home and Professional) with MS Office XP Editions
(Small Business, Standard, Student & Teachers, Professional)
Check under Add/Remove programs in the Windows control
panel to see which Microsoft Office XP Edition you
have installed and locate the matching CD.
Are you using
http://officeupdate.com to check for
updates needed for Office or MS Windows update?
========
Security update only asks for the Professional disk when I have Home edition
installed >>
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Let us know if this helped you,
Bob Buckland ?
MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx