Neither Frostwire or Limewire will give you virii if you download them from a trusted site. It's the material that you're downloading via a P2P network that is infecting you.
I have used basically all the programs out there (Limewire, Frostwire, Luckywire, etc) and have never gotten a virus period...the programs themselves will never give you a virus, just downloading blindly will. Just be careful which you are downloading..usually the top results are the best, meaning the ones with a lot of hosts to download from. Hope this helps