I wasn't as upset as it sounded
Windows didn't update because I have them disabled. There was a beep, but no message.
Whatever the problem was, it's back to working fine. I've been able to get it to run fairly consistently, and when it does run, I just leave it open. So I'ma call it magically 'fixed'.
Just theorycrasfting here, but It's possible that it was a multiple hard drive issue, since I consolidated them onto my SSD to decrease load times (which were getting large because of repeatedly adding extra folders) to save space on my small SSD but large 10TB secondary, and since then no issues, but I haven't been testing that long.
Either way, 7th Heaven and the mods are wonderful things. Thank you all so much. I am enjoying them immensely. I remember back in the days before 7th Heaven manually installing mods and how difficult is was then, even with these problems, 7th Heaven is much simpler.
Also, since the beginning, I have assumed that this difficulty stemmed from Windows-related strangeness or third-party application interference. Nothing against those who worked on this terrific software.