"better build quality"
macs = OK RAM
macs = Mediocre graphics card
macs = somewhat good HDD
you can upgrade a dell to a mega computer.
dell = stuffty plastic
macs also use cheap foxconn (or whatever its called) motherboards.
Dell uses Foxconn motherboards too
of course if you build your own computer you can get whatever quality of motherboard you want
Windows can be just as secure and stable as Mac OS X provided that the user isn't an ass-licking moron. OS X is catered to those kinds of people and absolutely idiot-proof their system with lots of things in order to ensure that the customer believes "Macs don't get viruses" or "Macs never break".
We're talking about OPs mom here. She might be the kind of person who needs a simple computer.
Mac OS X doesn't use too much idiot proofing, it uses the Unix architecture to be a really stable system. Windows 7 is a great OS, but Mac OS X will always be more stable because of it's better architecture.
If you want to see idiot proofing, take a look at all the notifications Microsoft Security Center shoves in your face.
Alert, an Appletard using fallacies to defend his one, true love!
The "Appletard" is actually correct, Apple overall is a big company and successful, but most of their success comes from the Mobile market.