I have been using LW for a considerable time with no problems at all, but you do need to be aware that there are some nasty people offering downloads which are not what they state.
I have found it helpful to do a search with a silly file name e.g. "5ttdge" and see what comes up. You can bet your life that any hits contain spam or virii. A further clue is that you can not browse the hosts. Do this a few times and add the offenders to your "blocked hosts" lists each time. This helps to sort the wheat from the chaff.