you need to go to the control panel, open add/remove programs and scroll down until you find it than click the add/remove button beside the name limewire... after you've uninstalled it if you want your computer to be totally clean of it delete the files, in the limewire folder, which is usually under program files. and the .limewire folder inside of documents and settings.
But I am left with the question why oh why uninstall great LW, is there nothing else to do?