Missing Product Key for Microsoft Office
Miscellaneous
Please also see this article.
How to obtain a new product key for Office program setup
http://support.microsoft.com/?kbid=823570
How to replace lost, broken, or missing Microsoft software or hardware
http://support.microsoft.com/?kbid=326246
How to order a replacement CD for Microsoft Office
http://support.microsoft.com/?kbid=302822