Well, crap, that opened up a whole can of worms.
Halfway thru the cleaning, a popup came up that said I needed to restart to open up user account control. Then, after restarting, the ‘USB Device Not Recognized’ problem came back. And, then, I had to run Delfix twice because the first time it didn’t produce a log (probably because I restarted in the middle of it cleaning). On the second run through, it froze. Finally, a warning came up asking me if I wanted to allow the following program to make changes to my hard drive: Command Center.