Are you using Windows?
Open Task Manager, check if a LW process is running. If it is, end the process. How did you uninstall LW? If you did it via Add/Remove programs, that can cause problems. If that's the case, use your computer's search to look for all Limewire files & folders...delete what you find.

The correct way to uninstall is start > All Programs > LimeWire > Uninstall. Or C:\Program Files\LimeWire\uninstall.