Tuto 1 
http://www.assistance-informatique-enligne.net/forum/systemes-d-exploitations-f6/sauvegardez-votre-activation-windows-t367.html

Tuto 2 
https://docs.google.com/viewer?a=v&pid=gmail&attid=0.1&thid=136e5ae4d872993f&mt=application/pdf&url=https://mail.google.com/mail/?ui%3D2%26ik%3D67756a0567%26view%3Datt%26th%3D136e5ae4d872993f%26attid%3D0.1%26disp%3Dsafe%26zw&sig=AHIEtbTn12htBsGww-U5bTOCyudCKgSWEg&pli=1