Things are looking up, I'm keeping my fingers crossed. Why am I suddenly hopeful? Well, when I turned on the pc, I got a cpu cooling fan warning, so I disconnected everything, took the side off and checked out the fan, and thought I might as well move the ssd cable to sata port 1. The W10 is now in port 5. Better still, use a new cable. Feeling very optimistic at this point, I have carried out a clean load of W7 ult 64 which I had wanted all along, loaded lan drivers and then straight to Windows updates. So far it has installed 178 including IE11 and graphics.