You could try deleting the limewire pref. folder. Points 2.) and 3.) in this thread:
Fixes for Limewire when LW isn't operating as it should! This will erase your settings for LW so you may want to make a note of them.
If that fails you could uninstall LW by going to C:\Programs\Limewire\Uninstall.exe. Don't use the Add/Remove programs tool in windows. Delete it then reinstall by downloading the offline installer version here:
http://www.limewire.com/english/cont...oadfree2.shtml