Well, first off, let's go in to what exactly your problem is? What is it exactly?

Also, stief suggested to try to start up with extensions off. That means to hold down the shift key while you're starting up. This will turn off all of your extentions. If it works then, you have an extentsion conflict, and to use Limewire, you can simply use no extensions or a very basic set, and then switch back for your normal set to do your graphics stuff.