Limewire & iTunes plus Unwanteds are uploading HD

I'm having considerable ease (so far) in placing Limewire uploads to my iMac iTunes iDisk system.

However, I just caught LW Monitor uploading to someone else my Interarchy app and just a wee bit earlier the new Virex 7.2.1 app the intrusive process of which I seemed to have managed to abort, or the intruder completed.

Now, before I build up a rhetoric against these varlets, I note I had two entries allowing permissions somewhere. The first had to do with users/something general. The second had to with with users/something general/something more narrowly appropriate to offering my iTunes music only, thru LimeWire only. Without intrusions into my Desktop or Hardrive?

I'll look for these last two items, but in the meantime is anyone familiar with what I'm talking about, someone who can assist me in adjusting my LimeWire offerings to what I want?

Can my use of LimeWire transmit virus into my iMac, or use my iMac as a sleepover spot that would leave me unaffected, but embed its viralself in outgoing communications with, say, Windows or Gnutella users?

Yours, Earful