For the windows users, i would recommend you change to Ubuntu. It is legally free, easy to use and if you don`t play games on your pc, then it will do everything you need. I made the switch a few years ago, and won`t go back. The latest version is very non geek friendly, and like Macs is inherently more secure than windows in the way it is coded, and the operating system is structured.
Macs are good to use and on average more stable than pc`s, but unless you have plenty of money, the initial setup costs are ridiculous. Especially here in Australia.
Anyway that is enough from me, back to the bench i go .