Microsoft Windows Error Code 0xC0000126: How to Fix It

Easy 20-40 minutes Medium Severity Verified June 2026
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Error Code
0xC0000126
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
20-40 minutes
Error code 0xC0000126 indicates that an operation was attempted on a special user account, such as the built-in Administrator or SYSTEM account, that cannot perform that action. This usually occurs when trying to run a program or modify settings under a restricted account. Follow the steps below to resolve the issue.
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Tools You'll Need

How to Fix Error Code 0xC0000126

  1. Run the Program as Administrator

    Only run programs you trust as administrator.

  2. Check Your User Account Type

  3. Run System File Checker (SFC)

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

  4. Perform a DISM Repair

    Ensure you have a stable internet connection.

  5. Boot into Safe Mode and Test

    In Safe Mode, some features may be disabled.

  6. Create a New User Account

    Transfer your files if needed before deleting the old account.
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When to Call a Professional

If the error persists after all steps, you may have a corrupted user profile or system files that cannot be repaired by basic tools. A professional technician can use advanced recovery options or perform a repair install of Windows.

Frequently Asked Questions

What does error 0xC0000126 mean?
It means a program or system operation is trying to perform an action on a special user account (like SYSTEM) that is not allowed. It often occurs when running a program without sufficient permissions.
How do I fix error 0xC0000126 on Windows 10?
Try running the program as administrator, check your account type (make sure it's administrator), run System File Checker (sfc /scannow), perform a DISM repair, boot into Safe Mode, or create a new user account.
Is error 0xC0000126 dangerous?
No, it's a common permission-related error and is not harmful. It simply prevents an operation on a restricted user account.
Can I ignore error 0xC0000126?
You can ignore it if the affected program or function is not essential. However, if it blocks important software, you should follow the troubleshooting steps to resolve it.
What if I cannot copy files due to error 0xC0000126?
This error may prevent file operations on system-protected accounts. Try using an administrator account or taking ownership of the files before copying.

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