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The "ILOVEYOU" virus is both a worm and a trojan horse.
"In comparison with viruses Trojan horses are not widely spread. The reasons of this are quite simple - they either destroy themselves together with the rest of the data on disks, or unmask their presence and are deleted by victimized users." --www.avp.ch
You see, the loveletter.txt.vbs file creates a trojan virus on the hard drive. (To accomplish this, it points the Internet Explorer browser to download a trojan WINDOWS-BUGFIX.EXE (or something like that), and then alters the registry to auto-run that program.)
"These [worms] spread in a computer network and, like viruses-"companions", don''t change files or sectors on disks. " --www.avp.ch
Obviously, "ILOVEYOU" also travels across networks (and the internet), so it is a worm. Once it gets to a target computer, as stated above, it downloads the trojan.