Excellent tips!
Worth a Sticky I think.
BTW LW is experimenting with known spam download hash filters with their present LW 5.2 beta series. LW will automatically delete any such file 'known' to be a virus at completion of download & then mark it as spam in search results. This then prevents people unknowingly sharing known virus spam files. And also protects their computer systems of course.
Welcome to the Gnutella forums.
Hope you share more of your experience here. We are always hoping experienced users will stay around giving advice & helping others out.