How to avoid errors during the update process

Since the basic stuff hasn't worked, the fix that's sorted this for me almost every time is resetting the Windows Update components from scratch. Stop the service first and Open command Prompt as admin : net stop wuauserv and net stop bits. After that rename all cache folders by running ren C:\Windows\SoftwareDistribution SoftwareDistribution.old and ren C:\Windows\System32\catroot2 catroot2.old, then you can again start the both services with net start wuauserv and net start bits. This clears out corrupted update files that the troubleshooter usually misses, and once the folders rebuild the updates tend to go through clean.

If it still chokes after that, run DISM /Online /Cleanup-Image /RestoreHealth followed by sfc /scannow, since persistent failures like yours often trace back to damaged system files underneath.