Windows Installation and Update

Check to see that all critical and necessary files are completely intact and functional like SFC /Scannow, and any other method you know of, so that when I go to re-install Windows 10 it will go smoothly and without a hitch! An example is that I can no longer use the pin I assigned to windows it just stopped working one day. And I've always had problems with the startup files from all versions of windows. Like my 1st install of windows 10 went bad because of the User.dat files getting corrupted, I couldn't repair windows, and I doubt that I could run restore and it would work. And I don't want to install windows 10 until I know it's going to run correctly.
I do nothing to corrupt files but they always seem to get screwed up by the operating system.


Thanks, L8R

windows product ID for win 10 Pro is erroneous number as reported in system information