When I enter a Limewire MP3 search for artist / title I inevitably get obscene / bogus titles which I believe to contain viruses or Trojans. For example, if I would type in "Sinatra", "That's Life", included in the results will be:

"thats life sinatra sexy girl has shaking orgasm during sex"

and another bogus file:

That's Life (no artist)

Is my computer infected? If so, what should I do?