(On UEFI/GPT the full path is "\EFI\Microsoft\Boot\BCD") The full path to this file is "\Boot\BCD".
In Windows Vista, Windows 7, Windows 8/8.1 and Windows 10 the System Boot Configuration Data (BCD) is stored in a file in folder "\Boot".
See how to create or obtain a Windows 7/8/10 installation/repair CD/DVD/USB. (use Visual BCD Editor or Dual-boot Repair tool to export/backup BCD or use "bcdedit /export backup-file-name" on elevated command prompt) Windows utility "bcdboot.exe" can repair the system BCDĪlways have A Windows installation/repair CD/DVD/USB ready before attempting any repairs of boot related files !.BCD can be accessed only with elevated administrative rights.(on UEFI/GPT based installations the system BCD is on EFI system partition) The system BCD resides on active (and primary) partition.Afterwards, carry on with the process as you would normally.Repair Windows BCD - Windows 10/8.1/7/Vista
To install the operating system from it you will have to set the device to boot from USB, right after powering it on. You have now created a bootable Windows 8.1 USB drive.
Identify the disk number of the USB drive (it can be recognized by looking at the size column it's usually the last listed disk) and type "select disk X", where "X" is the disk number of your USB drive.
The program will then show you a list of all the physical drives (HDD, SSD, USB, etc.) that are attached. Accept the UAC security prompt, if asked.
But, you can use it to download the ISO file directly from Microsoft's servers. Obviously, you cannot install Windows 8.1 using just the product key. How Does the Windows 8.1 Product Key Help? Please note that you need a Windows PC for this task. My colleague Wayne Williams has already written a guide which details all the steps that you have to go through. If you have a Windows 8 product key, you can download the Windows 8.1 ISO file directly from Microsoft's servers, and create a bootable USB drive as well.