Well the final outcome on my 2006 PC is that Windows 10 32 bit stays. I tried to clean install 64bit via the Media Creation Tool but it refused. I still think microsoft do not want folks to have old computers - so to microsoft I say:

I hope you never prosper
And I hope you always fail;
At everything you venture
I hope you n'er do well;
And the very ground you walk upon -
May the grass refuse to grow.....................