Welcome oziwombat.

Keep your anti-virus software up to date. And follow Birdy's advice here
http://www.gnutellaforums.com/downlo...tml#post348219 
I'm not sure about viruses on Linux, I thought Linux was immune, however any files that pass across to your windows could affect it. The new version of LW does delete 'some' known bad files once you complete the download. So that will definitely help.