That wouldn't be the problem as that padlock notice you see at the top of your searches is to notify you of a particular search result that contains a virus...
It's a 75.7 KB .exe & shows up as "Urgent LW update - download & install now". If people download that thing they could end up infected. To try to prevent careless people from downloading a dangerous file, the warning banner was added to LW's interface.
The padlock symbol doesn't apply to music or video etc, only to LW updates...
Please post these details, so we can see what is causing your problem...
http://www.gnutellaforums.com/connec...-you-post.html