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...

Try going to Tools > Options > Searching > Lisence Warning and make sure the box is not ticked and select apply...

If that still doesn't help try replacing the gnutella.net file...
Instructions on how to do this in this sticky....
If LW Will Not Connect

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You die for nothing...