Well, when Worst Buy, as you call it, bought Geek Squad they took an service of flamboyant (VW bugs and nerdy uniforms) technicians and over time replaced educated technicians with sales monkeys shown how to run canned programs and charge about half the value of the computer to fix the simplest problems. They have a bunch of the sales monkey at the counter and possibly a real technician working in the background on machines not fixed (or made worse) by the sales monkeys.
We don't have a Best Buy in my town but I have visited a good computer shop in a town that does. Their rates are much more reasonable than Geek Squad and they shared a few stories of computers brought to them after being taken to Best Buy.
I provide home and small business computer support (mostly Windows, occasionally Mac, and experimenting with Linux for some customers). I find that most malware will disable most anti-virus programs (Norton and McAfee for sure). Why pay a yearly cost for software that slows down your computer worse than the malware and gives you less protection than a free competitor? I used to like AVG Free but have been using the MS Security Essentials instead since people get annoyed with AVG changing versions and requiring a manual upgrade.
My philosophy anymore is to have some type of firewall enabled (Windows Firewall or another free one), an active anti-virus (MS Security Essentials or another free one), and preferably Firefox with ABP instead of IE. Most malware not prevented by these is something obtained by a socially engineered attack (e-mail attachments, web browser ads, etc.) and usually lead to a fake anti-virus program that asks for money to fix the problem it created and will block most methods that can remove it. I find that most can usually be cleaned up with Malwarebytes Anti-Malware running in Safe Mode.
The vendors and the manufacturers are both guilty of selling products and services that are not secure but give the customers a false feeling of being safe from everything. This leads to reckless behavior that those who understand security would avoid doing even with a secure system.
Computer security software is no match for the behavior of ignorant users that will disable or circumvent security provide by others. Computer education related to security doesn't hit home until these people have to pay someone to clean up the malware mess.