if you want to find your own product key, try magical jelly bean key finder. http://www.magicaljellybean.com/keyfinder/
don't ask for others.
we do not support piracy. discussing piracy is against forum rules.
if you need another key, buy one. that is the best way.
If you do not own a windows license, use Linux instead.
Ubuntu and Fedora are operating systems based on the Linux kernel. There are many operating systems that use the Linux kernel (sometimes these are called "Linux distros"). I recommend either Fedora 17 or Ubuntu 12.04.