Application Data's hidden by default. You'll have to show hidden files & folders to view it.

If you've got an old .limewire preferences folder, delete that. Now make sure you've shown hidden files etc & go & see if there's a folder called LimeWire (not .limewire) within App Data. If it's there, delete it. If it's not there, restart LW, go to your optioins & see if all the settings there are different to what you had set. Go right through options & reset everything. Apply to save your changes then restart LW again.