Microsoft Windows Error Code 0xC0000104: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC0000104
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC0000104 indicates that your Windows user logon session is in a bad state, often due to corrupted user profile or system files. This prevents you from signing in or using certain apps. Follow these steps to resolve the issue without losing your data.
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Tools You'll Need

How to Fix Error Code 0xC0000104

  1. Restart Your Computer

  2. Run System File Checker (SFC) in Safe Mode

    Running SFC can take 15-20 minutes. Do not interrupt the process.

  3. Use DISM to Repair System Image

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

  4. Create a New User Profile

    Back up important data before modifying user profiles.

  5. Perform a System Restore

    System Restore may remove recently installed apps or updates. Your personal files remain intact.

  6. Reset or Reinstall Windows

    Back up all important files before resetting. A clean install will erase everything.
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When to Call a Professional

If the error persists after trying all steps, or if you're uncomfortable with system-level changes, contact a professional technician. Corporate or domain-joined computers may require IT support.

Frequently Asked Questions

What causes Windows error 0xC0000104?
This error occurs when the logon session state is corrupted, often due to corrupted user profile, system file issues, or recent updates.
Can I fix error 0xC0000104 without losing data?
Yes, most fixes like SFC, DISM, and creating a new user profile preserve your personal files. Only a full reset or clean install may risk data loss if not backed up.
Is error 0xC0000104 the same as a blue screen?
No, this error typically appears as a message box or prevents login, not a blue screen. However, it may cause instability.
How long does it take to fix error 0xC0000104?
Most fixes take 30-60 minutes, depending on the severity. Safe Mode scans can take up to 20 minutes.
Should I reinstall Windows to fix this error?
Only as a last resort after trying all other steps. A reset with 'Keep my files' is less invasive than a clean install.

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