Windows announced that our upgrade from Win 7 to 10 was ready and so away we went. Everything went smoothly up to about 45%, then the progress messages stopped and the hard drive went quiet.

Now I can't start Windows, since the faulty installation of 10 has sidelined Windows 7. The only advice I have had is to "login in as administrator from the Start button". But I haven't got a Start button because I haven't got a working copy of Windows. .

How can I recover Windows 7 when I haven't got a working operating system?

Grateful for any advice,
Mike