Microsoft Windows Error Code 0xC0000105: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
Summarize with ChatGPTSummarize with ClaudeSummarize with Perplexity Add as Preferred Source on Google
Error Code
0xC0000105
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error 0xC0000105, also known as STATUS_LOGON_SESSION_COLLISION, occurs when Windows detects a duplicate logon session identifier. This usually happens after system updates or when using fast user switching. The error can prevent you from logging in or cause system instability. Follow these steps to resolve it.
Ad

Tools You'll Need

How to Fix Error Code 0xC0000105

  1. Restart Your Computer

  2. Boot into Safe Mode

    Back up important data before proceeding if possible.

  3. Run System File Checker (SFC)

  4. Run DISM Tool

  5. Clear User Profile Cache

    Editing the registry incorrectly can cause serious issues. Back up the registry before making changes.

  6. Perform a System Restore

  7. Create a New User Account

Ad

When to Call a Professional

If you are unable to boot into Safe Mode or perform registry edits, consider contacting a professional technician. Data recovery services may be needed if the error prevents access to critical files.

Frequently Asked Questions

What causes Windows error 0xC0000105?
This error is typically caused by corrupted user profiles, conflicts from fast user switching, or system file corruption after a Windows update.
Can I fix error 0xC0000105 without reinstalling Windows?
Yes, usually by clearing the user profile cache in the registry or performing a System Restore. Reinstalling is a last resort.
Does error 0xC0000105 mean my computer is hacked?
No, it is a system error related to logon session identifiers, not a sign of malware. However, it's always good to run a virus scan if you suspect infection.
How do I boot into Safe Mode if I can't log in?
Use Windows Recovery Environment: turn on your PC, hold the power button to force shutdown when the Windows logo appears, repeat 3 times to trigger Automatic Repair, then select Advanced options > Troubleshoot > Advanced options > Startup Settings > Restart > choose 4 (Safe Mode).
Will clearing the registry fix error 0xC0000105?
Clearing the .bak profile subkeys can resolve the issue if it's caused by a duplicate profile entry. Follow the steps carefully and back up the registry first.

Related Error Codes