The average computer user who doesn't know much about their computer will call an outfit like the Geek Squad to help them. Apparently there are many such people, as the company is booming. It is also a testament to the usability problems of personal computers these days.
Usually you can find remedies for computer problems on-line, if you know how to search and what to look for. Geek Squad can definitely help you, but for a high price. That may be worth it if you're in a rush or don't have the fortitude to find out a solution yourself.
Before someone buys a computer, they really should learn the basics so they a) know what computer to buy, b) know what options they need, c) know how to prepare the computer for use (e.g. firewall and anti-virus software installed and functioning), and d) understand how to maintain the computer (e.g. disk defragmentation, temporary file deletion, software updates, hard disk file organization, etc.).
Incidentally, I had a computer problem (self induced) and got the right advice to help me correct it here at Computer Hope. Judging by a number of knowledgeable people I've seen on this forum, it's a great place to get computer help!