Quote Originally Posted by trjp View Post
I've seen similar things with other AVs - and thus I tend to think you need a basic/solid AV (MSE) and a decent scanning anti-malware (Malwarebytes is probably still best - abeit they're doing their best to spoil it with junkware and stuff).
Agreed. Aside from antivirus, I also use Malwarebytes and SuperAntiSpyware (horrible name, but I've heard good things about it).

I had a partial infection by that fake antivirus some years ago too and in my case, the antivirus I was using (I don't remember if it was Avast or Avira at the time) also wasn't of much help.