hello A number of alternative BT clients have been said to contain spyware, trojans or other malware. The same is true for BitTorrent itself if you download "it" from sites other than Cohen's own site. A quick Google search shows that BitComet is one of these questioned clients. Of course, there are those who claim that it is not infested, but that is also what one would expect those who infested it (if they did) to say.