If I haven't updated MSE for awhile, I often find that the app-based update fails, saying connection was lost. So I download the defs manually, which...
Maybe download Windows 7, put it on a USB, and try installing that way? Using your product key of course to authorize, if you get that far. Could be...
How unfortunate to have this happen, you have my sympathy. Did you ever try to do the free upgrade to Windows 10? If so, you have a digital license,...