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Hi.
If your computer begins to feel buggy and you notice problems during boot, you can use the System File Checker (SFC) command-line utility to check the integrity and replace any corrupted or missing protected system files with a known good version.
When SFC is unable to fix the problem, chances are the utility was unable to get the necessary files from the Windows image, which might have become broken. In this situation, you can use DISM to repair the Windows image (.wim), which then it will allow you to use the System File Checker to fix any issue with your Windows 10 installation.
https://support.microsoft.com/en-us/help/929833...
After following the steps of the previous link try to update again, if it does not work, check this link.
https://answers.microsoft.com/en-us/windows/for...
Tell me how you are doing and let me know if the information has been helpful in solving your query.