Microsoft Windows Error Code 0xC000006B: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC000006B
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Windows error 0xC000006B, also known as STATUS_ILL_FORMED_PASSWORD, occurs when the password you enter contains characters that are not allowed or are formatted incorrectly. This typically happens during login or when changing a password. The error is usually easy to fix by checking your keyboard layout, password syntax, or using safe mode.
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Tools You'll Need

How to Fix Error Code 0xC000006B

  1. Check Keyboard Layout and Caps Lock

  2. Reset Password via Safe Mode

    Back up any important data before making changes to user accounts.

  3. Use Password Reset Disk (If Available)

  4. Enable Built-in Administrator Account

    Be cautious with the built-in administrator account; disable it after use for security.

  5. Check for System File Corruption

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When to Call a Professional

If none of the steps work, you may need professional help to recover data or reinstall Windows. This error is rarely hardware-related, but a technician can assist with advanced recovery tools.

Frequently Asked Questions

What characters are invalid in a Windows password?
Windows generally allows most characters, but some special characters like the backslash (\), semicolon (;), or quotes (") may cause issues, especially in certain configurations. Avoid using characters that could be interpreted as commands.
Can this error occur after a Windows update?
Yes, updates that change security policies or password settings can trigger error 0xC000006B. Resetting your password often resolves it.
Will resetting my password delete my files?
No, resetting your password via safe mode or password reset disk does not delete personal files. However, using a system restore or reinstallation might.
How do I boot into safe mode if I can't log in?
Restart your PC and press F8 repeatedly before the Windows logo appears. Alternatively, force shutdown three times to trigger automatic repair, then go to Advanced Options > Startup Settings > Restart > Safe Mode.
Is this error related to a corrupted user profile?
Possibly. If the profile is corrupted, you may need to create a new user account and migrate your data. Steps above can help troubleshoot.

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