Have you erased the operating system from the pc?
You won't find the product key on the CD.
What you needed to was run a program like magic jellybean or SIW to discover your product key then reformat the drive and reinstall the operating system.
You may need to phone Microsoft and explain your plight.
Thanks Regular. You have answered my question....
I will go to another PC and download Magic Jellybean:
Place the Workstation CD in the CD drive and
then do a find on the CD drive with the Workstation disk in it.
discover the product key (Write it down)(Right?)
Place the Workstation CD back in the orignal PC
Enter the product key and complete the installation