I fixed my computer; the culprit was my M.2 SSD where Windows was installed. It appears to be perfect and without any defects, but when I checked it for a short circuit, a small fault appeared, causing the SSD to shut down and turn on for less than 1 millisecond, causing the video driver and some other programs to fail. Both only started working again after restarting. Now I've put my Windows on an older SSD that I've had for longer, and everything is perfect again. I need to get used to working again; I'm completely lost. I have several images and ideas for animations to finish, but I can't mentally organize myself to complete them.
During the time the computer was malfunctioning, I created several scenes because I was able to do that, so I think I'll post them all first, then I'll start new projects. I have SO MUCH to post.
My computer has been working normally for 6 days without crashing, finally! This is a relief you can't even imagine.