What, you could download every virus man has ever created and one format later you'd be fine. You talk as if hackers can explode your monitor from 30000 miles away.
Also, torrents are 100% safe if you get them off a decent source. (boxtorrents, tokyotosho [Unless anon is being a dick]), with a decent client (utorrent). The way torrents work you cannot fuck with the data and pass it on.
Actually you sound like an idiot, install ubuntu; http://www.ubuntu.com/
Get utorrent and Mplayer and go off on your merry way, knowing that your OS is completly idiot-proof.