Error Code 0x800B0109: If you receive an error message stating “Some Windows update files are not signed correctly, installer encountered an error 0x800b0109,” this means the Windows service is unable to verify. Windows Update Error Code 0x800b0109 is common across all Windows operating systems
Reasons for Error Code 0x800B0109
- Communication failure with Microsoft update servers
- Proxy Internet connection interfering with updates
- Antivirus or security software blocking updates
- Broken or incomplete Windows Update system
- Network-related issues
Disable Proxy Internet Connection
- Open Internet Explorer and click on Tools > Internet Options.
- Navigate to the Connections tab and click on LAN Settings.
- Ensure the proxy server option is unchecked.
Note: If your antivirus software has proxy settings enabled, disable them as well.
Repair Windows Update Services
Follow these steps to reset Windows Update services using command lines:
- Open the Command Prompt as an administrator.
- Run the command:
net stop wuauservto stop the Windows Update service. - Navigate to
C:\Windows\and rename theSoftwareDistributionfolder toSoftwareDistribution.old. - Restart the Windows Update service using:
net start wuauserv. - Check for updates again to confirm the issue is resolved.
Note: These steps will not affect your personal data or programs.
Final Solution: Reinstall Windows Operating System
If all else fails, reinstalling Windows may be necessary:
- Back up all personal data to avoid data loss.
- Follow the official Microsoft guide to reinstall your version of Windows.
Important: Verify hardware compatibility with your Windows version before proceeding.
