How to solve the error code 0x800f0906: Windows Update failed in Windows 8.1

There are several steps you can take to solve the error code 0x800f0906 when Windows Update fails in Windows 8.1:

1. Run the Windows Update troubleshooter: Go to Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update. Follow the prompts to run the troubleshooter and see if it can fix the issue.
2. Check your internet connection: Make sure your internet connection is stable and strong enough to download and install updates. You can try resetting your router or modem to see if that helps.
3. Disable antivirus software: Sometimes antivirus software can interfere with Windows Update. Try disabling your antivirus software temporarily and see if that allows the update to install.
4. Install updates manually: If Windows Update continues to fail, you can try downloading and installing the updates manually. Go to the Microsoft Update Catalog website and search for the updates you need. Download and install them manually.
5. Reset Windows Update components: If none of the above steps work, you can try resetting the Windows Update components. Open Command Prompt as an administrator and type the following commands, pressing Enter after each one:

      net stop wuauserv
      net stop cryptSvc
      net stop bits
      net stop msiserver
      ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
      ren C:\Windows\System32\catroot2 catroot2.old
      net start wuauserv
      net start cryptSvc
      net start bits
      net start msiserver
  

After running these commands, restart your computer and try running Windows Update again.