McAfee has had problems for years.

In AVG, I just do a manual scan whenever it suits me...it's the updates that I want on automatic, and those happen every few days.....I just had one today. With new definitions regularly, I don't NEED a full scan very often. I haven't had a notice of a virus in several years, largely because we scan email online and delete anything suspicious before it is even ON our computer.......that, coupled with AVG and a firewall keep things pretty clean.