2006-09-20 How to change the Volume Licensing product key on a computer that is running Windows XP SP1 and later versions of Windows XP http://support.microsoft.com/default.aspx?scid=kb;en-us;Q328874 んで、これをやるのはめんどくさいので、簡単に出来るツールがある。 http://www.shivaranjan.com/2006/09/18/how-to-find-and-change-windows-product-key-and-registration-information/