Secure Boot protect users from rootkits and other low-level malware attacks by blocking unauthorized (non-signed) executables and drivers from being loaded during the boot process.
Secure Boot only works in UEFI Boot Mode
, when you enable Secure Boot in your PC's UEFI firmware (BIOS) settings. But if you have an OEM PC that came with Windows 8 64-bit preinstalled, then Secure Boot is turned on by default.
To confirm Secure Boot is enabled, within Windows 8 run the following command as administrator from the command prompt:
The result should be True