I half hoped this was about the person not the anti-virus snake oil.
In my opinion all anti-virus software is snake oil and crap, and they all show how inept they are. Just think about how many virus software killed itself or its operating system with updates in 2012 alone.
I am working at a very big company right now (till end of month), big enough to pay Kaspersky (their anti-virus de jour) for updates especially made for them. And even these expensive special signature updates were so broken one time last year that most Windows 7 PCs did not boot properly any more, and most of the ones that booted could not start Lotus Notes, the only email program allowed in the company,