Hi Tuan and Tews,
Your suggestion worked and I was able to complete Repair Install, thanks. I did a sfc/scannow again to see what result after repair and it reported no violations this time around, so big improvement. Tuan, I purchased Windows version at same time I purchased components for the system, retail not download.
I will now leave for 48 hours and then start up and see what happens. I must admit I am feeling much more optimistic than I was at the start of this post. I will let you know the result.