Many new PC’s don’t have the option to access the BIOS via the traditional F2/F10 key during boot. This is because they use a UEFI Firmware, the BIOS still exists but in a different form. To access these settings on a Windows 8 machine do the following:
1. Press win key + i
2. Open the power menu.
3. Hold shift and click restart.
4. Once the machine restarts you should see a blue screen with a number of options
5. Click troubleshoot
6. Click advanced
7. Click UEFI Firmware settings
That’s it, what you see from here is dependent on the manufacturer of your machine.