Microsoft Windows Error Code 0xC000000B: How to Fix It

Easy 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC000000B
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
30-60 minutes
Error code 0xC000000B, also known as STATUS_INVALID_CID, indicates that a program or process tried to use an invalid client ID for a thread. This often happens due to corrupt system files, outdated drivers, or third-party software conflicts. Rest assured, you can fix it by following the steps below.
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Tools You'll Need

How to Fix Error Code 0xC000000B

  1. Restart Your Computer

  2. Run System File Checker (SFC)

    Do not close the Command Prompt until the scan finishes.

  3. Run DISM Tool

  4. Update All Drivers

  5. Perform a Clean Boot

  6. Check for Windows Updates

  7. Run a Memory Diagnostic

    Back up important data before running memory tests.
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When to Call a Professional

If the error persists after all steps, or if memory diagnostics indicate faulty hardware, consider taking your PC to a professional technician for hardware replacement or advanced troubleshooting.

Frequently Asked Questions

What does error 0xC000000B mean?
It means a program tried to use an invalid client ID for a thread or process, often due to corrupt system files or driver issues.
Can error 0xC000000B be caused by malware?
Yes, malware can corrupt system files. Run a full antivirus scan with Windows Defender or a third-party tool as a precaution.
Will reinstalling Windows fix error 0xC000000B?
Reinstalling Windows is a last resort but can resolve persistent software-related causes. Backup your data before proceeding.
How do I run SFC if Windows won't boot?
Boot from a Windows installation media, select 'Repair your computer', then 'Troubleshoot' > 'Advanced options' > 'Command Prompt' and run 'sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows'.
Is error 0xC000000B a hardware error?
Not typically, but faulty RAM or hard drive can cause it. Run Windows Memory Diagnostic and check drive health with 'chkdsk /f' in Command Prompt.

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