For iTunes see:
http://www.kapsi.de/files/itunes.html (adding songs) It's much easier to use than the windows version.
I've never had a mac osx virus in 3 years I've been using it! (I did get 2 early mac viruses in OS 9 but not off the net.) At present OSX users are very safe. But I do have norton AV for to check folders of downlds just as insurance.
LW will only downld to where you tell it to. Go to LW's Preferences>Saving & direct it to the folder you want to save to or create one. Always press the Apply button whenever you change any of LW's preferences.