When updating to LW 4.18 & especially Pro, it can be wise to delete the old LW preferences folder. Just make a note of important settings first however because you will need to re-add all your settings.
http://www.gnutellaforums.com/genera...der-vista.html
Also, do a computer search for LimeWire ... see how many applications show.
If necessary, see
http://www.gnutellaforums.com/333278-post2.html however, use your Pro installer, not the one in the link shown.