What P2P software is better? Frostwire or Limewire?

Both programs are riddled with viruses, of course, and you run a risk of infecting your computer no matter what P2P software you're running. Thus the best way to protect your computer is to get all your media legally and only use P2P for known or local transfers. If that's infeasible, which I concede is likely, there's an easy way of checking for viruses with Limewire - right/control click on what you want to download, go to advanced, check against Bitzi. (Bitzi is a 'website where people cooperate to identify, describe, and discover files of all types', thus protecting against viruses to an extent.) Frostwire just has this built into a dialogue. I'd go with Limewire, then, because you'd have a wider user base to rely on and generally a more polished product. But vigilance is necessary in the use of whatever you decide upon. (Caveat - Frostwire is free, if cash is an issue that might preempt any other minor considerations.)