This guide helps you diagnose and fix problems related to Windows boot configuration, including BCD corruption, missing boot files, and startup failures.
Common Symptoms
- “Boot configuration data is missing or contains errors”
- Windows fails to start after an update
- Automatic Repair loop
- Black screen on startup
- System boots to BIOS repeatedly
Quick Fixes
- Restart the PC and disconnect external drives
- Check BIOS boot order
- Run Startup Repair
Advanced Fixes
Rebuild the BCD
bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
Run System File Checker
sfc /scannow
Run DISM Repair
dism /online /cleanup-image /restorehealth
When to Consider a Reset
If the system still fails to boot after BCD repair and file integrity checks, a Windows Reset or reinstall may be required.
Related Guides
