How to solve the error code 0x80240031: Windows Update failed in Windows 8.1

There are several steps you can take to solve the error code 0x80240031 in Windows 8.1:

1. Restart your computer: Sometimes, a simple restart can fix the issue.
2. Check your internet connection: Make sure your internet connection is stable and working properly.
3. Run the Windows Update troubleshooter: Windows has a built-in troubleshooter that can help identify and fix issues with Windows Update. To run the troubleshooter, go to Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update.
4. Clear the Windows Update cache: Sometimes, the Windows Update cache can become corrupted, causing issues with updates. To clear the cache, 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

5. Disable antivirus software: Sometimes, antivirus software can interfere with Windows Update. Try disabling your antivirus software temporarily and see if that fixes the issue.
6. Manually download and install the update: If all else fails, you can try manually downloading and installing the update from the Microsoft website.