Microsoft Windows Error Code 0xC000042B: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC000042B
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC000042B in Windows indicates a boot configuration or system file corruption issue, often resulting in a 'STATUS_REQUEST_OUT_OF_SEQUENCE' message. This error typically prevents Windows from starting and may require repairing the Boot Configuration Data (BCD) or restoring system files.
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Tools You'll Need

How to Fix Error Code 0xC000042B

  1. Boot from Windows Installation Media

    Ensure you have a valid Windows installation media. Back up important data if possible before proceeding.

  2. Access Command Prompt

  3. Rebuild Boot Configuration Data (BCD)

    Be careful not to mistype commands. This process can alter boot settings.

  4. Run System File Checker (SFC) and DISM

    This step may take 15-30 minutes depending on system speed.

  5. Perform a System Restore (if available)

    System Restore may undo recent software changes but typically does not affect personal files.
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When to Call a Professional

If you cannot create or boot from installation media, or if the above steps fail to resolve the error, you may need professional help from a computer technician or Microsoft support.

Frequently Asked Questions

What causes error 0xC000042B in Windows?
This error is usually caused by corrupted Boot Configuration Data (BCD), damaged system files, or incorrect boot order settings. It can also result from a failed Windows update or hard drive issues.
Can I fix error 0xC000042B without a Windows installation disc?
You can use a recovery drive or system repair disc if you created one previously. Otherwise, you'll need a Windows installation USB or DVD to access the recovery environment.
Will I lose data if I fix this error?
The steps provided (BCD rebuild, SFC, DISM, System Restore) are designed to preserve your personal files. However, it's always recommended to back up important data if possible before repairing boot issues.
Does this error mean my hard drive is failing?
Not necessarily. While a failing hard drive can cause boot errors, 0xC000042B is typically a software issue related to boot configuration. However, if the error persists, consider running a hard drive diagnostic (e.g., CHKDSK).
How do I create a Windows installation USB?
On another working computer, go to Microsoft's official website, download the Media Creation Tool, and run it. Choose 'Create installation media for another PC' and follow the instructions to make a bootable USB (minimum 8GB).

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