Thanks, Mike; me, too.
And a giant thank you, too, Richard. I went poking around that Driver Sweeper and, sure enough, it had deleted those same files you gave me. Program's deleted now,
Right, after you mentioned the registry, I thought, ah, screw it, I'll just do a reinstall. It went all right; a few random drivers had to be reinstalled.
But, seriously, thank you for being diligent in fixing the problem; most others would've given in a long time ago (myself included, lol!).
The effort you put in is astounding, really.
You, too! The snow is slowly melting, but it just needs to stick it out for just a few more days!