Windows 8 File bootbcd missing

You will need a Windows 10 USB, create one using the windows 10 media creation tool.
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1. boot from the usb once its created.
2. it will prompt you to select language, country and keyboard, press next.
3. Select repair your computer at the bottom left.
4. click on troubleshoot -> advanced options -> command prompt
5. type Bootrec /fixmbr and press the enter key.
6. type Bootrec /fixboot and press the enter key.
7. type Bootrec /scanos and press the enter key.
8. type Bootrec /rebuildbcd and press the enter key.
9. type "A" to add the installation to the boot list and hit enter.
10. exit the command prompt and press continue (do not reboot just yet)

Hope it helps!