The obvious statement of
is indeed obvious, at least to you and I, it is. Problem is, I'm not the one who ran into this problem, my girlfriend is. She's generally pretty tech savvy, but is prone to boneheaded moments and being impulsive/not thinking things through.
Don't install and antivirus software on a non-root drive, you say? Yeah, I already knew that, and this is what I told her, but by that point, it was already too late! lol. That one scene from the movie "airplane!" comes to mind. The face-palm one. I've been using IMMUNET for years, and only just made an account here on the support forums for her derp moment, because I have had zero issues. She can build and maintain a hackintosh, and installs, uses, and does advanced configurations for Linux with ease, but she bungles Windows. Go figure. She's had me guessing for a decade already.
I'll give the revo-uninstall utility a try, and maybe look into similar tools from the open-source world on alternative-to or slant if that fails. I know for a fact there are some on the portableapps webstore, so maybe that might be preferable to having to install another program, cramming more subdir and bloat into the appdata folder lol. I knew solutions like this exist, I was just hoping there would be a simpler solution, in vain, it seems so far. Thanks, anyway.