1) Uninstall any of these non-Microsoft software using the applicable uninstall tool:
a) antivirus
b) firewall
c) drive encryption
2) Perform an in place upgrade repair:
https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html
https://www.tenforums.com/tutorials/9230-download-windows-10-iso-file.html
https://www.microsoft.com/en-us/software-download/windows10
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