Thanks for the nice comment. I could even boast a little bit about a project that I took on after leaving the active fire service, introducing two totally new fire suppression technologies, developed by the U.S. wildland fire community to the structural fire service. That took several years, but it did turn out well from my quite biased viewpoint, as the technology is now in use worldwide.
Turning from that to something of actual importance, I changed the new user profile to an administrator one, and changed to it. I was then able to open a Windows PowerShell (admin) window, so with a certain amount of trepidation, entered dism /online /Cleanup-image /restorehealth, and pressed Enter.
My anxiety was quickly relieved, for as soon as dism.exe started to run, it did something that I had never seen previously, dropping down a line and typing something; I did not bother to make a note of that, so don't know what it said. Next, there was another new line, which looked odd, but which was showing the progress percent, plus a 1 off to the right. The process seemed to be taking a long time, so I left the room to do something other than stare at the screen, but did return not overly long thereafter, where I saw a really nice message, namely that the dism.exe process had completed correctly.
Sure seems to me that you called it completely correctly, that my current default admin profile is corrupt.
Your further ministrations are awaited.