The error code 0x0000012A is associated with a Blue Screen of Death (BSOD) in Windows and refers to the bug check message MUI_NO_VALID_SYSTEM_LANGUAGE. This indicates a critical system issue related to the Multilingual User Interface (MUI).

Understanding MUI_NO_VALID_SYSTEM_LANGUAGE:

• Multilingual User Interface (MUI): Windows supports displaying the user interface (menus, buttons, etc.) in various languages. MUI is the technology that enables this functionality.

• Missing or Corrupted Language Pack: The error message signifies that Windows couldn’t find any installed or licensed language packs for the system’s default user interface language. This could happen due to a few reasons:

  • Missing Language Pack: You might not have installed a language pack for your desired display language.
  • Corrupted Language Pack: The language pack you’re using might be corrupted due to software conflicts or disk errors.
  • Incorrect System Locale Settings (Less Likely): In rare cases, incorrect system locale settings might lead to Windows failing to identify the appropriate language pack.

Troubleshooting Steps for 0x0000012A:

Here’s how to address the 0x0000012A error:

1. Verify Language Pack Installation:

   • Open Settings > Time & language > Language.
   • Ensure the desired language is selected as the “Windows display language.”
   • Click on “Add a language” if it’s not already installed.
   • Choose your desired language from the list and select “Set as default.” This will download and install the necessary language pack.

2. System File Checker (SFC) Scan (if still encountering issues):

   • Open Command Prompt (Admin).

   • Type the following command and press Enter:

     <code data-test-id="code-content" data-sourcepos="28:6-30:17">sfc /scannow
     </code>

   • This command scans your system files and attempts to repair any corrupted system files that might be indirectly affecting MUI functionality.

3. DISM Scan (if SFC fails):

   • If the SFC scan fails to repair the corrupt file, you can try using the Deployment Image Servicing and Management (DISM) tool, which can address broader system image corruption issues.

     • Open Command Prompt (Admin).

     • Type the following command and press Enter (this can take time):

       <code data-test-id="code-content" data-sourcepos="40:8-42:49">DISM /Online /Cleanup-Image /RestoreHealth
       </code>

     • After DISM finishes, rerun the SFC scan as mentioned in step 2.

4. Recreate User Profile (if applicable):

   • In rare cases, a corrupted user profile might contribute to the issue. Creating a new user profile can help isolate the problem. Refer to Microsoft’s documentation for steps on creating a new user profile: https://support.microsoft.com/en-us/windows/create-a-local-user-or-administrator-account-in-windows-20de74e0-ac7f-3502-a866-32915af2a34d (Be cautious about data loss; ensure you back up important files from your current profile before creating a new one.)

Additional Tips:

• Keep your Windows system updated with the latest patches and security fixes.
• Consider using a system restore point if you recently made changes to your system language settings and the error started occurring afterward.

For Users Without Administrator Access:

If you’re using a computer where you don’t have administrator privileges, consult your system administrator for assistance with installing language packs or troubleshooting MUI issues.

Important Note:

The 0x0000012A error typically occurs during the system boot process. If you’re unable to boot your computer normally due to this BSOD, you might need to boot into Safe Mode with Networking to access the settings and perform troubleshooting steps. Refer to Microsoft’s documentation for instructions on booting into Safe Mode: https://support.microsoft.com/en-us/windows/start-your-pc-in-safe-mode-in-windows-92c27cff-db89-8644-1ce4-b3e5e56fe234 (These instructions might also apply to older Windows versions.)

By focusing on verifying language pack installation, system file integrity checks, and potentially recreating a user profile if necessary, you can increase your chances of resolving the 0x0000012A error and ensuring Windows displays the user interface in your preferred language.