To disable "Secure Boot"...
1. Make sure disabling it is actually necessary. If installing older software, or untrusted software, then you may need to disable it. However, if you are installing newer versions of Windows, you should not need to disable it.
2. Open BIOS.
3. Locate the Secure Boot setting, and if possible, set it to "Disabled". This can be found in either the "Security" tab, the "Boot" tab, or the "Authentication" tab.
4. Save your changes and exit.
5. The computer should reboot.
6. Now you can install the graphics card, hardware, or operating system that’s not compatible with Secure Boot.
7. If this isn't working for you, in some cases, you may need to change other settings in the firmware, such as enabling a...