I have no comment as I would never risk my PC to such a complicated repair action.
Kees, you and the others are absolutely right. This is the time-wasting experiment in which I learn this lesson. I'm absolutely certain everyone on this Board has been in this position during the course of their Windows educations, and I'm going to share my current situation here just for the entertainment value.
The correct recovery method is to re-install a quality image. Due to a confluence of circumstances I don't have one.

The last few days I've been migrating my backup media from external HDDs to external SSDs (Samsung T7's). Yesterday I put an image on the SSD for this computer, placed it in my safe, then performed a low-level format of the corresponding HDD (I currently have 13 HDDs to try to sell). When I realized I'd probably performed a difficulty-reversible assault on this machine, I pulled the SSD to install the image. I noticed that the image was about 11GB when it should have been about 350GB. So no backups.
Hmmm, I need to call upon my 'inner MacGyver'! I've been in this 'yellow flag' position many times before and began to focus hard on the problem at hand., rather excited by the challenge What is my situation? High risk. It is my wife's work computer and she returns tomorrow. Fortunately, she has with her the mirrored work laptop she brings on trips, so no matter what she can continue working.
The reason for the 11GB image turns out to be a misselection of partitions chosen to include in the image; first time for that. Furthermore, this is the one computer (of six) on which OneDrive is active. Job one is to copy all the files on the still-functioning computer in several locations; that's the one impossible-to-replace asset. I now have those files copied in three different locations in addition to on the mirrored laptop and on the OneDrive cloud; just finished that now at 4am. (Who can sleep when there's such a great creative problem to solve!)
Next, do I try to repair the computer or do a fresh install? It's late and that decision can wait until tomorrow. One benefit of the fresh install would be to eliminate the HP bloatware currently on the machine. A downside is that I set up OneDrive at least five years ago and I'm not sure I can replicate that (who knows how OneDrive has changed in five years). Stay tuned for tomorrow. Same Bat-time; same Bat-channel!
Important note: I am
not asking for advice, although I'll always listen to it. I am
not desperate. My situation is solvable and I'll learn through the process of solving it. This novel is for your entertainment only.