It's possible you actually have a virus. I was getting a similar pop up (I also use McAfee) and when I would check my program, it was always disabled. I would go enable it and it would almost immediately disable again. I updated everything then did a complete virus scan and it found one. Only one, but it was in several places. It was actually a virus that disables your antivirus software. So try running the virus scan and see what it finds. Once I found the virus and cleaned it, I've had no problems with any popups.