Be very careful of programs as many of them do have viruses, it would be wise to check the files with Bitzi before proceeding to download them... This thread will tell you how to use it....
http://www.gnutellaforums.com/showthread.php?t=37676

Also check this thread out, it will help you with what to stay away from...
http://www.gnutellaforums.com/showthread.php?t=41432