have you tried reinstalling?
to reinstall you need to make shure you have the password and e-mail you used to get the password if you can't remember go to http://www.limewire.com/english/cont...pro_lookup.jsp
to uninstall you go to add/remove programs and uninstall there, than you delete the files, in the limewire folder, which is usually under program files. and the .limewire folder inside of documents and settings