this is what pop s up on startup

Limewire was unable to write a necessary file because you do not have the necessary permissions. Your preferences may not be maintained the next time you start Limewire, or Limewire may behave in unexpected ways.

Now ive tried everything i unistalled and re installed tried using the new version makes no diffrence and i am head admin on pc so i dont understand why it doesnt have permissions anyone able to help?