Wow, I missed that one. It is staring me in the face. As Noel said, only ever have 1 antivirus.
I didn't find a removal tool for McAfee, but AVG had one: Download tools and utilities | AVG Worldwide
use the 32 bit if your system is 32 bit. This ensures that the antivirus is completely removed so as to avoid conflicts with your other antivirus program (the only one you use, whichever it is).