This should give you some answers. It is probable that this is caused by a virus.
http://www.gnutellaforums.com/showth...threadid=41432
Itsmee...... It is however possible that you are not going to preferences>advanced>system start up>uncheck box and remember to click apply>ok. There is another setting for connecting to the network when you start Limewire and this can be confusing.