If you're smart about torrents it's very hard to get a virus from one. They fingerprint the files, and any change at all to even a single file changes the fingerprint. You download in pieces, and if a piece doesn't have the proper hash (fingerprint) then it gets deleted instead of assembled into the file. The only way to get a virus from a torrent download is if the original uploader had the files infected when they created the torrent. If they get infected later, they don't match anymore, and the peers downloading from the will reject the pieces, and too many rejects will ban the seeder from the pool for having a contaminated file set.
Most torrent sites link torrents to a forum post, so people can leave feedback on them. If a torrent is infected, someone will notify the site admin, who will check it out and remove the torrent. Thus if a torrent has been downloaded many times and has been online for over a week, odds are very high that the torrent is clean.
The safety of torrents, as long as you bother to read the comments, is why I teach so many people I know how to use them to download whatever you want. The way they work insures you get an exact copy of the original files, and an infection can't be passed from one computer to another through them very easily.
Saying you're afraid of getting a virus from a torrent is a pretty absurd thing in that light. Just make sure you are downloading from a site that allows comments, like The Pirate Bay or Demonoid.
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