http://www.irongeek.com/i.php?page=security/changemac
http://www.gorlani.com/portal/projects/macmakeup-for-vista-seven-2008-windows-8
http://social.technet.microsoft.com/Forums/windows/en-US/697bf48c-a226-4315-8875-2bbeddf16db2/how-to-change-a-mac-address-on-windows-7