Fixing ERROR_THREAD_MODE_NOT_BACKGROUND 401 (0x191) Error: A Step-by-Step Guide

Key Notes

  • Review the settings of the problematic application.
  • Try running the affected app in compatibility mode.
  • Repair any corrupted system files.

Troubleshooting ERROR_THREAD_MODE_NOT_BACKGROUND in Windows: A Comprehensive Guide

The ERROR_THREAD_MODE_NOT_BACKGROUND is a common issue for Windows users, usually resulting from application conflicts or operating system errors. This guide offers step-by-step solutions to effectively resolve this error.

How to Resolve ERROR_THREAD_MODE_NOT_BACKGROUND?

Step 1: Review the Settings of the Problematic Application

This error may be linked to certain settings within the application. Begin by checking for any configuration errors or conflicts. If needed, feel free to consult the application’s support for guidance.

Step 2: Execute the Application in Compatibility Mode

  1. Right-click the application’s executable file (.exe), then choose Properties.

  2. In the Compatibility tab, check the box next to Run this program in compatibility mode for and select an earlier version of Windows from the dropdown.

  3. Click Apply and then OK. Restart your computer to see if the issue is fixed.

Step 3: Fix Corrupted System Files

  1. Open Search using Windows + S, type Command Prompt, and right-click to select Run as Administrator.

  2. When prompted, click Yes to allow changes.

  3. Enter the following DISM commands one by one, pressing Enter after each:

    DISM /Online /Cleanup-Image /CheckHealth DISM /Online /Cleanup-Image /ScanHealth DISM /Online /Cleanup-Image /RestoreHealth

  4. Then run: sfc /scannow

  5. Finally, restart your PC to apply the changes.

Pro Tip: Make sure to run these scans regularly to keep your system healthy.

Step 4: Reinstall the Problematic Application

  1. Press Windows + R to open the Run dialog, type appwiz.cpl, and press Enter.

  2. Locate the problematic program and click Uninstall.

  3. Follow the prompts to uninstall the application, then restart your PC.

  4. Download and install the application from a verified source.

Pro Tip: If uninstallation fails, utilize a dedicated removal tool to clear all remnants of the previous installation before you proceed.

Step 5: Initiate a System Restore

  1. Open Search again with Windows + S, type Create a restore point, and select the result.

  2. Click on the System Restore option.

  3. If available, select Choose a different restore point and then click Next.

  4. Select the earliest restore point listed and click Next.

  5. Confirm the selection, click Finish, and proceed with the restoration.

Pro Tip: Ensure to choose a restore point from before the error started to eliminate recent changes affecting your system.

Additional Tips

  • Consider regularly updating your system to prevent errors.
  • Perform regular backups to safeguard your data.
  • Use reliable antivirus software to help prevent application conflicts.

Summary

Resolving the ERROR_THREAD_MODE_NOT_BACKGROUND involves reviewing application settings, running the application in compatibility mode, repairing corrupted system files, reinstalling problematic applications, and performing a system restore. Following these steps can generally bring your system back to optimal performance.

Conclusion

By following the outlined troubleshooting methods, you can effectively tackle the ERROR_THREAD_MODE_NOT_BACKGROUND and improve your system’s stability. Don’t hesitate to seek professional support if the error persists beyond these steps.

FAQ (Frequently Asked Questions)

What causes the ERROR_THREAD_MODE_NOT_BACKGROUND?

This error is typically caused by application settings conflicts or corrupted system files.

How can I prevent this error in the future?

Regular updates, proper system maintenance, and the use of reliable antivirus programs can help reduce the risk of future errors.