Now up and running w10.
Only small hitch was when I tried to swap my video capture PCI card into the new desktop and found that the bracket was about two inches too long for the case
Just unscrewed it and secured the card by more 'artesanal' means for now!
It also did not recognize the ps2 mouse, so I just use a USB one (there are eight or so USB ports anyhow).
Thanks for all the help chaps, and for sharing your knowledge. Much appreciated