Working in the industry i have noticed that the free anti viruses have a delay on the updates. Usually 12 - 24 hours.

I personally use AVG free edition and have found that it does a good job. Viruses are usually a smaller file, if your audio download is less than 2 MB then be aware. 871.7kb is a sure sign of a trojan.

As I have worked in the repair centre I have often advised parents that the cost of fixing the bug ridden computer outweighs the cost of downloading the tracks that you are after. ($0.99 per album if you know where to go)

Limewire is good but be careful in what files you download. I refuse to download anything in quicktime format because of the websites that pop up when playing and the fact that they do not hold what they say they portray.

Any bugs that i have inadvertantly downloaded have been soon sorted out with a good scan.

BTW I am the manager of an internet cafe.