Windows 2000 Professional.

How can I find the Product Key: on CD-ROM Disk?. Couple of years ago, I bought Windows 2000 Pro at Fry’s Electronics but somehow I lost the box with the Certificate of Autenticity and the Product Key with it, the CD-Rom I have it in a CD Wallet with other software. Now I’m using Windows ME Upgrade version after Windows 98SE. Can anyone help me to find the Product Key on CD? is there a way or software to dowload or to buy for this purpose?. I’ll appreciate any information that can help.
Please reply.
Thank you.
tcroitoru@msn.com