I have downloaded some objects from for example BitTorrent - normally without any problems with worms. But many times, when I downloads programs by Limewire and open the rar/zip-files my antivirus program tell me that the file contains "Worm B(?)" or other worms...

Can somebody here tell me - why? I can't see why it should be more worms in Limewire objects compared to the same files from for example BitTorrrent... :-(

Is it only coincidences or not?