I'm not sure why that is happening...Give these fixes ago and see if they help...
Try uninstalling your Java from the add/remove programs and then re-install the JRE offline version....(5th one down)
http://java.sun.com/javase/downloads/index_jdk5.jsp
Then uninstall Limewire using the uninstaller which is found in start > all programs > limewire...then re-install it using the offline installer...
http://www.limewire.com/english/cont...oadfree2.shtml
If that does not help with your problem try deleting your preference folder...
Fixes for Limewire when LW isn't operating as it should