When upgrading to pro, it's usually wise to delete the older LW preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.) or for vista see http://www.gnutellaforums.com/genera...der-vista.html

Make a note of your settings first however, you will need to redo your settings after doing the above.

Go to Tools > Options > Advanced > Performance, disable Ultrapeer capability.