It means you were not aware of spam on the network & to avoid it. It looks like you inadvertently downloaded a virus. See these WARNING: Viruses on network you should be aware of! (click on blue link) & also http://www.gnutellaforums.com/genera...m-startup.html

Files to avoid: Virus thread: Typical virus spam file sizes - Make a note of them (click on blue link to see)