Good question! Yes, I am running it with Admin rights, as it will not let me do otherwise.
Also, I got the driver to say "libusbK (v3.0.7.0)" now consistently when I plug the switch in. I'm not really sure how. When it's in RCM mode it says "APK" and when it's in the MTP homebrew it says "Switch." The driver installation never comes up anymore, but both flashing the correct .bin file and trying to use the MTP homebrew does nothing. Okay, this is a persistent curse, and it's really annoying me. >.<
Oddly enough, flashing a .bin does give the successful message, but it does nothing other than apparently knocking the switch out of RCM mode until I manually power cycle it.