Just to re-iterate, just b/c you can't browse someone does not mean they are not sharing. And those who do not have their firewalls properly configured to allow LW full access will be very difficult to browse & almost impossible to direct connect to. In search results, those with their locations in
red are
firewalled. You can often still downld from them but probably won't be able to browse them.
If you right-click (Control-click for mac) on top of columns then more column view options are available such as Location. This will indicate whether they have configured their firewalls properly.
For computer based firewall softw configuration for LW see:
http://www.limewire.com/english/content/firewalls.shtml for the most common firewalls.