https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5001716-update-fails-with-0x80070643-errors-how-to-fix/ > Microsoft is pushing out a Windows 10 KB5001716 update used to improve Windows Update that is ironically failing to install, showing 0x80070643 errors. > Titled 'KB5001716: Update for Windows Update Service components,' this update has been pushed out by Microsoft over the years when new functionality needs to be added to Windows Update.