For doing a repair install of Windows 10, follow whichever of the three
following instruction sets you prefer.  But, definitely download a fresh
copy of both the Media Creation Tool and create a fresh copy of the Windows
10 install media using it.

You should never, and I mean never, use an old copy when it comes to Windows
10.

*Doing an In-place "Upgrade" to Reinstall Windows 10 Keeping Apps/Programs
and User Files (
https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html
)

*

*Non Destructive Repair of Windows 10 - Answers to commonly asked questions
(
https://www.experts-exchange.com/articles/31982/Non-Destructive-Repair-of-Windows-10-Answers-to-commonly-asked-questions.html
)

*

*How to: Perform a Repair Upgrade Using the Windows 10 ISO file (
https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install-winpc/how-to-perform-a-repair-upgrade-using-the-windows/35160fbe-9352-4e70-9887-f40096ec3085?auth=1
)

* If, by chance, you want to entirely wipe the slate and start completely
afresh with Windows 10, then follow these instructions for:

*Doing a Completely Clean Install of Windows 10 (
https://www.bleepingcomputer.com/forums/t/667627/doing-a-completely-clean-install-of-windows-10/
)*

A completely clean install will wipe everything, your user accounts, data,
and installed programs so make backups and have installers if you want to
put same back on the new installation of Windows 10.
--

Brian *-* Windows 10 Home, 64-Bit, Version 1809, Build 17763

*   Explanations exist; they have existed for all time; there is always a
well-known solution to every human problem — neat, plausible, and wrong.*

         ~ H.L. Mencken, AKA The Sage of Baltimore