I have been running AVG constantly for 5+ years, and also occasionally run Malware Bites.
When I realized that most virus reports were coming from an invisible section of the computer, I decided to investigate. First off: f*ck you Windows. Why do you make c:users/myname/appdata invisible? What happened to the "show hidden files" of Win9x?
Second:omg, you wouldn't believe how much shit I found in there. All kinds of little things with permissions set to deny:delete. Eventually, I sent AVG to specifically search that whole folder and it found even more. Point being, just because you run a virus scan doesn't mean you are finding shit.
I had nearly 100 GoogleUpdateSetup.exe files stashed in every hidden place imaginable. What's worse is that AVG doesn't even find the bastards. I don't who they Google fucktards are, but they sound like a pretty disreputable company. I think I am switching to Linux finally, and living up to my promise of open-source only.
Grr.