Hello glenn7777,
The product key on the Certificate of Authenticity (CoA) on the bottom of the laptop is for the Windows Operating System installed on the latop--it is not for Office.
Please have a look at this help article for further info about purchasing a product key to convert your Trial of Office into a perpetually licensed Office product.
http://office.microsoft.com/en-us/help/HA101936151033.aspx
For great advice on all topics XP, visit http://www.annoyances.org/exec/forum/winxp