How to fix error code 0x80240031: Windows update encountered an unknown error in Windows 8

To address the error code 0x80240031, follow these steps:

1. Restart your computer: A simple restart can sometimes fix the issue.
2. Run the Windows Update troubleshooter: Use the built-in troubleshooter to identify and fix problems with Windows Update. Go to Settings > Update & Security > Troubleshoot > Windows Update.
3. Check your internet connection: Ensure your computer is connected to the internet and the connection is stable. If using Wi-Fi, try a direct connection with an Ethernet cable.
4. Disable your antivirus software: Temporarily disable your antivirus software as it may interfere with Windows Update.
5. Clear the Windows Update cache: A corrupted cache can cause issues. Open Command Prompt as an administrator and enter these commands:

        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

6. Reset Windows Update components: If the problem persists, reset the update components. Open Command Prompt as an administrator and type the following commands:

        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
        wuauclt.exe /updatenow

After completing these steps, try running Windows Update again to check if the issue is resolved.