Exactly the same thing apply for Windows. On windows you only get viruses if you do shady things/shady java websites and so on. It's not like you start a windows computer and after five minutes it automatically get infected
Well, this might happen with windows.
No, seriously.
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True story.
Install Windows XP on a machine and go surf the web for 1hr and you'll get a virus/trojan 90%.
No active firewall, Internet Explorer 7, OS not updated, no UAC... Do I need to say more? lol