something simular happened to me a few times, and it even re-installed limewire a few times using the link created by the installation of limewire
how i fixed it was to go create a shortcut on the desktop to the limewire file, it is the same as the one limewire places on the desktop, but i have not had any problems since i created a new shortcut to the file
"C:\Program Files\LimeWire\LimeWire.exe"
just right click on the desktop and choose NEW and then choose SHORTCUT to create a shortcut and paste the addy into the space provided and see if that helps, it fixed my trouble, hope it helps fix yours