How To Uninstall Your Windows Product Key Before You Sell Your PC
 

Do you have an old PC you want to sell, but also want to use your Windows license on your new PC ? There is a hidden command in Windows that allows you to do just that. Read on to find out more.

Note: Between Microsoft and your OEM there are a number of different laws that determine whether you are allowed to use your license on another PC, so follow this tutorial at your own risk. Additionally before you go through the tutorial you will want to check that your product key is still attached to your PC/Installation CD, if it is not , do a quick Google search on how to recover it.

http://www.howtogeek.com/124286/how-...-sell-your-pc/