Boot into Automatic Repair by forcing shutdown during startup 2–3 times, then use Startup Repair via Troubleshoot > Advanced Options; 2. If enabled, use System Restore to revert to a working state before the issue; 3. In Command Prompt, run bootrec /scanos, bootrec /fixmbr, bootrec /fixboot, and bootrec /rebuildbcd, using bootsect /nt60 sys if access is denied; 4. Run chkdsk C: /f /r to fix disk and file system errors; 5. Repair the registry by loading and replacing the SYSTEM hive from RegBack backups if corrupted; 6. As a last resort, reset Windows while keeping files via Reset this PC. Most cases can be resolved without data loss by carefully using recovery tools to fix boot configuration, system files, or registry issues.
If you're seeing a "Bad System Configuration Info" error (often with a blue screen and stop code INACCESSIBLE_BOOT_DEVICE or 0x00000074), it usually means Windows can't read or interpret critical system configuration data during startup. This commonly happens after a failed update, driver issue, or registry corruption. Here’s how to fix it:
1. Boot into Automatic Repair / Recovery Environment
When your PC fails to start, Windows should automatically launch Automatic Repair after a few restart attempts.
- Turn the PC on and off during boot 2–3 times to trigger Automatic Repair.
- Once in the recovery environment, go to:
Troubleshoot > Advanced Options > Startup Repair
Let Windows try to fix the issue automatically. This often resolves config-related boot problems.
? If Startup Repair doesn’t work, proceed to the next steps.
2. Use System Restore (if enabled)
If you had System Restore enabled, rolling back to a restore point before the issue occurred can fix corrupted system settings.
In the recovery environment:
Troubleshoot > Advanced Options > System Restore
- Follow the prompts to select a restore point.
- Choose a point when the system was working properly.
- Confirm and let Windows restore system files and settings.
This often resolves bad configuration issues caused by recent software or driver changes.
3. Run Startup Repair and Fix Boot Configuration (BCD)
If the boot configuration data (BCD) is corrupted, rebuilding it can help.
From Advanced Options:
Command Prompt
Then run these commands in order:
bootrec /scanos bootrec /fixmbr bootrec /fixboot bootrec /rebuildbcd
?? If you get "Access Denied" on
/fixboot, try:bootsect /nt60 sysThen repeat the above commands.
These commands repair the master boot record and rebuild the boot configuration database, which often resolves "Bad System Config Info."
4. Check for Disk Errors
A failing or corrupted drive can cause configuration read errors.
In Command Prompt (from recovery):
chkdsk C: /f /r
Replace
C:if your Windows installation is on a different drive (e.g.,D:).
This scans and repairs file system and disk errors. Let it complete — it may take a while.
5. Repair Registry (Advanced)
If the registry hive (especially SYSTEM) is corrupted, Windows can't load configuration info.
In Command Prompt:
reg load hklm\temp C:\Windows\System32\config\SYSTEM
If this fails, the SYSTEM hive is likely damaged. You can try replacing it with a backup:
cd C:\Windows\System32\config\RegBack copy *
Then copy the backup files to C:\Windows\System32\config\ (you may need to rename or overwrite the corrupted ones).
?? Be careful — editing the registry incorrectly can make things worse.
Alternatively, Windows may auto-load a good registry backup if you run:
rstrui.exe
And perform a system restore.
6. Reset Windows (Last Resort)
If nothing works, reset Windows while keeping your files:
Troubleshoot > Reset this PC > Keep my files
This reinstalls Windows but preserves personal data. It removes bad configurations and drivers that might be causing the issue.
? Make sure you’ve tried to back up data first (use a bootable USB tool like Ubuntu or a recovery disk if needed).
Prevention Tips
- Keep regular backups or system restore points.
- Avoid abrupt shutdowns during updates.
- Use reliable antivirus software to prevent corruption.
Basically, the key is getting into recovery mode and using built-in tools to repair boot files, restore the system, or fix the registry. Most cases can be resolved without losing data — if you act carefully.
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