Booting to black screen + blinking caret -- can't repair

I appreciate the advice. I'll have to decide whether to continue that never ending battle.

What are the status of the important files?
a) backed up to another drive or cloud?
b) not yet backed up?

Another possible fix may be a reset save files equivalent (reinstall drivers and applications).

zbook said:

What are the status of the important files?
a) backed up to another drive or cloud?
b) not yet backed up?

B; I'll just copy them over to my APFS partition when I feel like reinstalling.

Another possible fix may be a reset save files equivalent (reinstall drivers and applications).

I can't say I've heard of that before. Can you elaborate?

See this link:
Custom Install Windows 10

Ah, right. Yes, it doesn't hurt to try that initially.

It wasn't super clear on what happens with directories outside the Windows directory, like Program Files, Users, etc. Do they get moved into Windows.old as well?

I'll back everything up, but if it works I guess it'll at least save me from copying everything back to the partition again.

Thanks. I don't think it's the issue here since the Macbook Air 2012 doesn't have any secondary GPU apart from Intel's. Unless the Bootcamp driver installer installed unnecessary nvidia drivers there are no such drivers on the system. The Windows installation has worked well up until now, but it probably got corrupted or something when an update was interrupted.

I can boot macOS 10.14 just fine.

How would I install them onto my non booting Windows installation once I have them?