I have a new Dell Inspiron notebook which came with Windows 7 Home Premium 64-bit. I want to go to Windows 7 Ultimate 64-bit. I have a clean Windows 7 Ultimate 64-bit image from MSDN. Do I need to modify the BIOS to allow for pre-activation of Windows 7 Ultimate or will Windows 7 Home Premium pre-activation work for Ultimate as well? I know I need a Windows 7 Ultimate key, but do I need a new certificate as well?