C:\Documents and Settings\*yourusername*\Application Data\limewire is the new location of the LW preferences folder. BTW the Application Data folder is a "Hidden" folder. To find it, see the tips here used when deleting the LW 4.10+ prefs folder:
Fixes for Limewire (see tip #3) But of course don't delete the folder, that's just a clue about where to find it & it's directory location.