Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Install by downloading and running the "full file" installation package here: http://www.microsoft.com/downloads/en/details.aspx?familyid=85af7bfd-6f69-4289-8bd1-eb966bcdfb5e&displaylang=en
While the above will work for most people, there is still a chance that it might not, covered here: http://support.microsoft.com/?kbid=828451
It's a little late to bring this up :-) but if you bought a computer with Office XP installed and no installation discs or Certificate of Authenticity were provided, they probably gave you pirated software. If your Office XP is Office XP Professional with Front Page, it's almost a slam-dunk that it's pirated.