This low disk space thing can be a problem, if you've tried antivirus stuff, make sure limewire is shut down, look in Windows explorer/my computer in your Limewire folders. look for the "incomplete" folder, go into it and delete every file in it (dont worry it wont break) ONLY THIS FOLDER THOUGH!! then empty your recycle bin. that should be it.
You see, lime wire keeps all the files you've ever tried to load in this "incomplete" folder- even the complete ones! and thats a lot of disk space friend:, by emptying it you clear the history.