Enable Windows F8 Safe Mode Boot Key

Follow steps below to enable F8 safe mode boot (applies to Windows 10 and 8.1):

1. Boot PC using Windows 10 or  8.1 ISO USB flash drive or DVD
2. Click Next to skip the first screen
3. Press Shift + F10 To open advanced Command prompt window

Type the following command to enable F8 Safe Mode boot key:

bcdedit /set {default} bootmenupolicy legacy

Type Exit and press Enter to quit the Command Prompt. Remove your usb flash drive or DVD and turn your computer off. When you start your PC, you can now press F8 to get the Advanced Boot Options menu