Can't change system font bc of AVG leftovers

Hi everyone. (Win 7 Pro 64 HP 6300)
Preface: I have set up my computer meticulously for a very long time and been really careful and am not going to reinstall windows because it is functioning properly and all the customization I have done would take about another year to complete again. So I need you guys to be creative and think outside the box for fixes bc a clean slate is not really an option. I am lucky it is working properly, as I am usually a glitch magnet.

A long time ago I installed AVG system tuneup.
Yes, I realize that was stupid.
It had some customization options I wanted to take advantage of but I didn't realize how adept it was at worming its way into my system files and hanging on for dear life.
I have gotten rid of pretty much everything that allows it to run any processes, but some of the system changes are still applied.
That's fine, I don't mind, the app changed things I would probably not have been able to change any other way (at least I tell myself that).

So here's my problem:
I don't remember super-well, I have epilepsy and it messes with my head so bear with me. I THINK I used avg to change my system font. I have tried going into the registry and changing the fonts in
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes
But I have had no luck. At this point I am not even doing this just for looks - although I will be improving them if I can get it right.

I have a My Little Pony theme going on (don't judge). So I picked Equestria as the font initially. Which was a bad choice because it apparently runs small and is really hard on the eyes - reading it is a chore and I think I need glasses anyways.

So I got a better font that's still theme appropriate.
But I still can't change it.
Even running the reg file to reset the system fonts didn't work, so I know it is being overridden somewhere.
The only other idea I have is to go into the registry and find where all the fonts are listed and change the target for equestria to the font file I would prefer using. Except I don't think I would ever be able to use equestria for anything again....unless I reinstalled it under a different name?

So, yeah, that's where I am at.

Any ideas?

Did you run the program from their website that totally removes it as that should solve it they have known issues with uninstall hence why they produced the tool