Microsoft Windows Error Code 0xC000040A: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC000040A
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Windows error code 0xC000040A indicates a nonvolatile memory (NV) buffer failure, often caused by faulty RAM, corrupt system files, or driver issues. This guide provides step-by-step fixes to resolve the problem without losing your data.
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Tools You'll Need

How to Fix Error Code 0xC000040A

  1. Run Windows Memory Diagnostic

    Back up your data before running the test.

  2. Check for Windows Updates

  3. Run SFC and DISM Scans

  4. Update or Roll Back Graphics Drivers

  5. Perform a Clean Boot

  6. Use System Restore

    This will undo recent system changes but keeps your personal files.

Parts You May Need

RAM Module (if faulty)
Check Price on Amazon
RAM Module (if faulty)
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RAM Module (if faulty)
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RAM Module (if faulty)
Check Price on Amazon
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When to Call a Professional

If all steps fail and the error persists, consider contacting a professional technician or Microsoft Support. This could indicate hardware failure requiring replacement.

Frequently Asked Questions

What does error code 0xC000040A mean?
It means Windows encountered a nonvolatile memory buffer failure, often due to faulty RAM, corrupted system files, or driver issues.
Can error 0xC000040A be fixed without reinstalling Windows?
Yes, in most cases it can be fixed by running memory diagnostics, updating drivers, or repairing system files with SFC/DISM.
Is error 0xC000040A a sign of a failing hard drive?
Not usually; it's more commonly linked to RAM or driver problems, though a failing SSD could also cause it.
What should I do if the error occurs during startup?
Try booting into Safe Mode (press F8 during boot) and run the steps above, especially the memory diagnostic and system file scans.
Do I need to replace my RAM to fix error 0xC000040A?
Only if the Windows Memory Diagnostic identifies errors. Otherwise, try other fixes first.

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