Look for a file called "limewire.props"
(In System Folder->Preferences->.limewire )

For a clean install you need to trash it (it contains all your preferences), or to really do a clean install, also trash the .limewire folder.

Do you have OSX on your machine too? (just wondering if LW is reading from the wrong prefs). You can use sherlock to search for anything containing "limew" both visible and invisible in case there are some old prefs sitting in unexpected places.