I And now everything is smooth except for that double profile pic at start up which even the Microsoft engineers have no clue how to correct it up to this point.
This may be a question you cannot answer now, as you have the OS up and running. I have just made a complete reinstall, right through both OS builds, paying a lot of attention, with pauses and reboots, to the progress.
I believe, and this is a real wildy, that my double picture login came, when I manually updated one or two items in the device manager. Dell drivers, pre downloaded. In particular, the Intel QM57 Express Chipset LPC Interface Controller. But I was so busy with the updates at the time, that it is very much speculation.
Anyway, for the book, I have sent it pretty much as written here, as feedback.
In anticipation. I rolled back that particular driver, but the double picture remained.