Microsoft Windows Error Code 0xC0000042: How to Fix It

Medium 30 minutes to 2 hours Medium Severity Verified June 2026
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Error Code
0xC0000042
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30 minutes to 2 hours
Error code 0xC0000042, also known as STATUS_INVALID_PORT_HANDLE, indicates that Windows has encountered an invalid Local Procedure Call (LPC) port handle. This often happens due to corrupted system files, driver issues, or malware. The fix typically involves running system file checker, updating drivers, or performing a clean boot.
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Tools You'll Need

How to Fix Error Code 0xC0000042

  1. Run System File Checker (SFC)

  2. Use DISM Tool

  3. Update Device Drivers

    Back up your data before updating drivers, especially graphics drivers.

  4. Perform a Clean Boot

  5. Run Malware Scan

    Ensure your antivirus is up to date before scanning.

  6. Check Event Viewer for Clues

  7. Repair Install Windows

    Back up important data before proceeding, as unexpected issues can cause data loss.
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When to Call a Professional

If you are not comfortable running command-line tools or performing a repair install, or if the error persists after all steps, contact a professional technician. Also consider professional help if you suspect hardware failure.

Frequently Asked Questions

What causes Windows error 0xC0000042?
This error is usually caused by corrupted system files, outdated or faulty device drivers, malware infection, or conflicts with third-party software. The error indicates an invalid LPC port handle.
Can error 0xC0000042 cause data loss?
The error itself does not cause data loss, but if it leads to frequent crashes, you may lose unsaved work. It's always a good idea to back up important data regularly.
Is 0xC0000042 a hardware error?
No, this is typically a software error. However, faulty hardware like RAM or hard drive can sometimes cause similar symptoms. If software fixes don't work, run hardware diagnostics.
How long does it take to fix error 0xC0000042?
Simple fixes like running SFC can take 15-30 minutes. More involved steps like a repair install can take 1-2 hours. The total time depends on the underlying cause.
Do I need to reinstall Windows to fix this error?
Reinstalling Windows is a last resort. Try all other steps first, including SFC, DISM, driver updates, and clean boot. A repair install (in-place upgrade) is less drastic than a full reinstall.

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