Frostwire is a peer-to-peer file sharing program that many people do not like to use because of viruses that you may accidentally download. But it's actually not that bad as long as you look at the information in the song and are able to tell whether or not it's a virus.
Frostwire is fine. Bascially, just don't be dumb. Here are a few things I use to tell whether or not a file contains a virus.
-If the song or artist is spelled incorrectly
-If there is no length shown
-If there is a different title other than the actual title of the song
-If the length of a song isn't that long but the size is like, over 10,000 KB
-Also, I only download mp3 files
All in all just pay attention to what you're searching and if you're paranoid like me scan each song using your anti-virus program.