Mommosan,
Here is something you might try first. Go to control panel, open the Java icon, select the browser tab and uncheck both IE and Netscape. Reboot and try Limewire.
If that doesn't work you can uninstall Java from the add/remove section.
You will have to go to
http://java.com/en/index.jsp and download Java if you don't have a copy to reinstall.
Good luck,
Norm