Thank you Mike.
That will work, but at a cost of around $200; new 1-2 Tb Hard drive and the Easus program to recover the files. Why the new Hard Drive? My Drive_C is on a 320 GB drive and I need 600-800 Gb of space to recover the files.
Note: Both the programs mentioned in the Article are free to recover 1 GB of data only. I have lost around 600 Gb. I am using the Easus program as the MiniTool program would not run on my system.
I am still very surprised though that there was no UNDO command, especially when you consider how many times Windows normally asks for confirmation whenever you simply want to install a program, but with this command in Administrative Tools there is just "Click on X" and it is done, no going back!