Since he just did the upgrade an in place repair install really makes no sense. Now doing another clean install would make sense at this point depending especially since this was a computer running Windows 7 and may have had issues prior to the upgrade the user wasn't aware of.
This was your post # 4:Hi The way I understand this issue, the PC never upgraded to W10! Maybe I'm missing some thing. It tries and then fails and goes back to the original OS.
Not every PC will up grade to W10 successfully . That's the reason for my reply #29. When it says (Post#1) " We couldn't Complete updates, Undoing changes" " Don't Turn off your Computer" To me, this means the update failed and it's going back to the original OS! Why it's doing that! I don't know and that is the issue here!