What's a good program to download music with?

I've used Frostwire and Limewire, but they both messed up my computer. I have Shareaza right now but it doesn't have all the songs that I want. Anyone know a good program to use that I can get songs, and music videos without messing my computer up?
It simultaneously searches more than 80 free, safe, legal music sites including:

beemp3.com
airmp3.net
music.download.com
free-albums.net
mp3realm.org
mp3search.mobi
megadownload.net
mp3street.org
dilandau.com
mp3-center.org
seekasong.com
easymusicdownload.com
music-rapidshare.com
rapidonlinemusic.co.uk
sharedmp3.net
music-download.cc
top1000mp3.net
mp3s.pl
classicalarchives.com
phazemp3.com
rapidsearch.in
mp3dd.net
musik.am
totally-free-music.com
mp3int.com
downloadmp3hits.com
musicrake.com
musire.com
mp3raid.com
entertube.org
misshacker.com
huntmymusic.com
get-music.net

And many more.

With this search engine you can find songs or entire albums, for the last I suggest to include the word "rapidshare" in your search. For example, if you search for "jordin sparks rapidshare" you'll find the album "Jordin Sparks" by Jordin Sparks to download.

Also, you don't need to create an account nor pay or buy anything.

It can't infect your computer, it's not a program. Just search for your songs in this site, and download it for free. If you insist on program, try using torrents. Download Torrent client like uTorrent and search for torrents in sites located below.

You need a dvd to ipod converter to help you, because most of movies/videos formats are not played on iPod directly. I downloaded a video to iPod Converter Suite to help me.
This software can convert both DVD's and videos to ipod directly. It's fast,easy and very wonderful. I think it is a good choose.