there is a way...but it takes a few clicks:
ctr + alt + dlt - then task manager (some PCs will go straight to the task manager)
then IF limewire is there RIGHT click it and press "go to process". Once there, it should have highlighted its process. RIGHT click it and press "end process"
This is the BEST way to close a non responsive program
If LW isnt there, then go directly to the process list (by pressing the processes list) and search for the limewire image name. Then there u should be able to end process itself. If you cant find it...u should be looking for the name "LimeWire.exe"
If that dosnt work...sorry u might need to uninstall/then reinstall LW