Access the BIOS on a Windows 8.0/8.1 Operating System

On a system with Windows 8 you can access the Unified Extensible Firmware Interface -(UEFI) or what it was used to be called BIOS screen from the new Windows 8 boot menu:

- Open Charms (Press the Windows key + C, OR swipe in from the right edge of the screen) 
- Click: Settings.
- Click: Change PC Settings.
- In "PC Settings", click: Update and Recovery
- Click: Recovery
- Under "Advanced start-up", click: "Restart now"

This action will restart your system and show the Windows 8 boot menu.

- In the boot menu, select Troubleshoot
- In the Troubleshoot menu, select Advanced options
- In the Advanced options menu, select UEFI Firmware Settings
- Click Restart to restart the system and enter UEFI (BIOS).