Try downloading and installing Limewire again using the offline installer. Remove your current one first through start>programs>limewire>uninstall
Get it here
If that doesn't fix it then try reinstalling the Java as well. Also using the Offline installer. Remove old version through add/remove programs
http://www.java.com/en/download/index.jsp
Some other Fixes incase none of the above work
Fixes for Limewire when LW isn't operating as it should
If none of these things work then post the name of every Antivirus and spyware program on your PC
BTW Do a malwarescan as well.
Well that's all the ideas you get from me tonight