No idea about frostwire (assuming you're legit and not a spammer trying to funnel traffic to frostwire?) but if you have limited computer skills be wary of file sharing. If anything you download unzips as an exe or similar assume it's a virus, delete it and try again. Also paranoia-wise it's probably not a good idea to use your real name and say hi I'm looking for illegal downloads.
You could also check this thread for alternatives:
Sources of Free Music