If you lost your product key, download, unzip and run Produkey from the following website:
http://download.cnet.com/ProduKey/3000-2094_4-10457063.html?tag=mncol
This program will let you view the product key for Windows and other software installed on your computer.
If you have an HP, Dell, Compaq, Gateway computer, etc. look around the computer case and you will find a sticker with the product key on it. Some have the product key on the back, some infront, some on top and others on the side. Good luck!

