Microsoft Windows Error Code 0xC00003F0: How to Fix It

Medium 1-3 hours Medium Severity Verified July 2026
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Error Code
0xC00003F0
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
Error code 0xC00003F0 (STATUS_BAD_SERVICE_ENTRYPOINT) indicates that a Windows service has a bad or missing entrypoint, preventing it from starting properly. This often occurs due to a corrupted system file, a failed driver update, or malware infection. The steps below will help you diagnose and fix the issue.
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How to Fix Error Code 0xC00003F0

  1. Perform a Clean Boot

  2. Run System File Checker (SFC)

    Do not close the Command Prompt while the scan is running.

  3. Use DISM to Repair System Image

    Ensure you have a stable internet connection, as DISM may download files from Windows Update.

  4. Check for Malware

  5. Update Drivers and Windows

  6. Perform System Restore

    System Restore will not affect personal files, but it may remove recently installed programs.

  7. Reset or Reinstall Windows

    Back up important data before proceeding, as this option may remove apps and settings.
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When to Call a Professional

If the error persists after trying all the above steps, or if you are uncomfortable using the Command Line, consider contacting a professional technician. They can perform advanced repairs or recover data if needed.

Frequently Asked Questions

What causes error code 0xC00003F0?
Error 0xC00003F0 is caused by a corrupted system file, a faulty driver, or a malware infection that damages a service's entrypoint. It often appears after a failed update or software installation.
Can I fix error 0xC00003F0 without reinstalling Windows?
Yes, many users resolve it by running SFC and DISM scans, performing a clean boot, or using System Restore. Reinstalling Windows is a last resort.
Is error 0xC00003F0 a virus?
Not necessarily, but malware can cause this error. Running a full antivirus scan is recommended to rule out infection.
Will a system restore delete my files?
No, System Restore only reverts system files, settings, and installed programs. Your personal documents, photos, and files remain untouched.
How long does it take to fix error 0xC00003F0?
Most fixes take 15-30 minutes, but running DISM or a full malware scan can take up to an hour. If you need to reset Windows, plan for 1-3 hours.

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