You can disable Secure Boot by restarting your PC and opening the Unified Extensible Firmware Interface (UEFI).

Disable Secure Boot through UEFI, but only if you really need to This article explains how to disable Secure Boot on your computer. This security feature, enabled by default and included in Unified ...

Secure Boot is a feature of your computer's UEFI that only allows approved operating systems to boot up.

Here's how to enable Secure Boot and TPM 2.0 in case you're running into issues while playing Call of Duty Black Ops 7.

It sounds to me like claiming that all old Windows versions will be unbootable is an overstatement. Rather, it's most likely the case that you won't be able to boot old media when Secure Boot is ...