Hi
I have had this problem as well and re-installed twice. After reading these posts I installed crapcleaner and used it. Checked my java platform too, but before I did anything else, I searched and found all the limewire files in my computer. I was able to open limewire from there even though I couldn't open it from anywhere else. Also, it seems that if limewire is in the "tray" perhaps you can't open it from anywhere else. Anyway, I pursue because I really like Limewire!
Roberta