It's difficult to tell if your problem comes from not turning off the "
Secure Boot" in the BIOS/UEFI. Secure Boot was, in part, Microsoft's attempt to keep hardware from migrating to other operating systems.
It could also be a bit more complicated/insidious:
http://answers.microsoft.com/en-us/windows/forum/windows_install/sorry-the-computer-boot-certificate-has-expired/7b125910-d100-4071-bda0-d063c0469d17Post in Thread wrote:
I sent my CTL CL1 netbook into CTL for repair. they said that Windows 8 does some sort of verification with the BIOS in place of a key-based authentication. and since the BIOS on this machine pre-dates the functionality Windows 8 expected, it caused this behavior. the only repair they could offer is to replace the mother board.
bad news all around i think
If you cannot disable "
Secure Boot" and use a
Legacy boot option, you can blame Steve Balmer.