Well, your first question seemed to be a LimeWire-specific question, you should ask that in the LimeWire forum - or even better search for threads where people put the same question already.

As for your second question: 1) read the FAQ (people here like to pretend that nobody is engaging in copyright infringement on Gnutella) and 2) I have no idea what your problem was. I never purchased anything that I downloaded from Gnutella.