AVG free is quite a good option. Regular updates and it's free. However... If you get one on torrent you will probably find a full program complete with key for unlimited use.
If you take the later option i would suggest nod32. By far the most advanced program. Not as user friendly though.
Hope that helps. 8)
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How large is AVG, in regards to filesize? Because I only need something to cover for me until I move out, and if I can torrent something smaller/quicker, I'll do that.
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AVG is around 30MB. If you into illegal stuff, search a torrent site for Kaspersky or NOD32, I believe those are slightly smaller. Also a lot better protection.
The home version of Avast! Antivirus is totally free, and it's great. Plus, you can make it pirate-themed! (The normal skin is just a sleek silver one, but you can find pirate skins for it...)
I agree with AVG free. I've found form experience that the best AntiVirus that you can get is McAfee, but that costs money. The best one for a person with a budget of $0.00 would be AVG free.