It worked like a charm on a notebook and we did three other clean intalations and it all went fine. But the main computer said no.
Luckily Windows 10 installation was able to return us to the previous Windows 7 version. After looking at the error and the cause, we have learned that 0xC19000101 – 0x40017 error can be caused by antivirus such as Avast.
Since we had Avast, we think we are on right track. People at various forums have seen and resolved this error. Interestingly enough, a similar error happened a while ago when people wanted to upgrade from Windows 8 to 8.1 and it looks like the same fault applies to Windows 10.
Since it is all caused by antivirus software, it is strongly recommend that you uninstall it before attempting an upgrade. Windows 10 in its upgrade process won't detect antivirus software or complain that one needs to to uninstall it before proceeding.
If you managed to install Windows 10 and you are not happy with it and want to go back, this is what you have to do.
If it’s been less than a month since you upgraded to Windows 10, you can go back to your previous version of Windows from Settings > Update & security > Recovery. If you don’t see Go back to Windows 7 or Go back to Windows 8.1 listed there, use a different recovery option.