This is a step by step tutorial or a beginner’s guide to How to rebuild BCD (Boot Configuration DATA) and rebuild MBR (Master Boot Record) in Windows 10 & Windows 8 | 8.1.

Rebuilding BCD | Boot configuration data | MBR

To check & rebuild the Windows BCD:

  • If you are able to access lock screen on Windows, Press & keep holding the shift key & click on Restart to open Windows Recovery Environment (WinRE)
  • If not,
  • Insert the original Windows DVD/USB and boot from it
  • You can also use Windows Recovery Media
  • Select your Language & keyboard options
  • Click Next
  • Click on Repair your computer

windows10_repair_boot

  • Click Troubleshoot
  • Click on Advanced Options
  • Click on Command Prompt

command_prompt_diagnostics_menu_windows10

  • Now,
  • Type bootrec /fixmbr
  • Press Enter
  • Then,
  • Type bootrec /fixboot
  • Press Enter
  • Then,
  • Type bootrec /rebuildbcd
  • Press Enter
  • Now, Type Exit

bootrec

  • Restart your computer