What has this got to do with Secure Boot?
It's got nothing to do with Secure Boot. If he had gone into the UEFI and disabled Secure Boot, the problem would still have occurred.
Secure Boot has become this scapegoat for everything that could possibly go wrong.
As its name suggests, Secure Boot prevents the OS from booting. If the installer is complaining about a product key mismatch, then it's got everything to do with the installer and nothing to do with Secure Boot.
Here's what you said:
> Hear my fucked up story of UEFI, Secure Boot and Windows 8:
Why mention Secure Boot at all? It's got absolutely nothing to do with your situation.
Suppose that a user buys a Windows 8 machine, goes to a website, and downloads malware that slows down the machine and makes it unusable. Finally, a local teenager wipes the machine, disables Secure Boot, and installs Windows 7.
One would hardly say that this is a "f-cked up story of" malware, Secure Boot, and Windows 8. Secure Boot is merely incidental, and has nothing to do with the issue of malware on Windows 8.
Secure Boot systems verify your OS against a key stored on your hardware.