tools option is for windows or OS 9. For OSX it's in your preferences, under the LW name at top of menu bar next to apple icon. (Keyboard shortcut = ⌘ ,)

Try deleting your LW prefs folder whilst LW is closed, found here:
/Users/your_username/Library/Preferences/LimeWire

Sorry Lord of the rings but now i forgot the original advice and i cant seem to locate the post - what did i need to do in Preferences again? I tried the advice you just gave me but that doesnt seem to work. Once again many thankyous! : )