madmatt: That's pretty much exactly what I meant, and now I feel silly!

It is, to my knowledge, possible to repair this through Repair Console, though, is it not? I mean, copy the file from the disk into the appropriate folder and reboot? Just a curious observation, because I believe I recall fixing a similar problem that way in the past before I could boot to do a SFC scan, but there's a small chance I'm remembering wrong.