Why does the Windows 10 upgrade from Windows 7 Ultimate fail after reverting back to Win 7 following a previous Win 10 upgrade ?

[Steve Gunn]

I updated my PC from Windows 7 Ultimate to Windows 10 Pro successfully and it all worked fine for 10 - 15 minutes until I restarted my antivirus program after which I started randomly getting the BYOD. I reverted back to Windows 7, investigated the problem, saw it was due to the antivirus program so I deleted the antivirus program. When I went to reinstall Widows 10, the installation now fails. The installation completes the download of the updates but when it starts installing Windows 10 Pro it only gets to 2% done before a "There was a problem" message appears, followed by "Attempting to re

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