Ever heard of anti-virus software?
I don't use a Mac because I don't want to look like a pretentious t***. Plus I like to game!
Sure av will stop everything, hope you don't live by that.. Most of us are fine, we know how to care for our wild little friend windows, since we love what it can give us, games, 99.5% of apps, free hardware choices etc etc
But think if we had any good unix system with such power as windows now, it would solve a ton of problems. Ok unix systems are still insecure, but at least if you do get into them you have another layer get through, standard user -> root which is trivial if the user is not running the most up to date kernel.. Where as most windows system have no where near that layer security..
Cba I am just typing, macs are cool for xbox fags..