Could you be a little bit more specific?
Is Microsoft Word 2002 (Microsoft Word XP) a stand-alone install? (i.e. Did you purchase "Microsoft Word" and
NOT a suite/edition of Microsoft Office which included Microsoft Word?)
Is Microsoft Access 2002 (Microsoft Access XP) a stand-alone install? (i.e. Did you purchase "Microsoft
Access" and NOT a suite/edition of Microsoft Office which included Microsoft Access?)
What suite/edition is this Microsoft Office 2002 (Microsoft Office XP) Upgrade? (i.e. Microsoft Office XP
Standard Edition?)
In addition, these links may help:
Products that qualify for the Microsoft Office XP upgrade
http://support.microsoft.com/kb/290540/
Upgrade detection fails when you upgrade to Office XP
http://support.microsoft.com/kb/295346/