Windows guides
How to Rebuild the BCD in Windows 10 or Windows 8.1
Repair Boot Configuration Data from Windows Recovery Environment, using Startup Repair first and Bootrec or BCDBoot only when needed.
THE JOURNAL
Master Boot Record
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Troubleshooting
Repair the Master Boot Record in Windows 8 (Legacy BIOS/MBR Only, Historical)
Use Windows Recovery and Bootrec to repair master boot code on a Windows 8 installation that actually uses legacy BIOS/MBR booting.