The Limewire software is completely virus and spyware free...
You must relise that what you choose to download may not be, LW has no way in controlling what is being shared....
Take a look at this thread it will tell you what to stay away from
http://www.gnutellaforums.com/showthread.php?t=41432
Also read through the stickies at the beggining of the open discussion forum, they have lots of useful info in them.....