Did you follow the advice here?
http://www.gnutellaforums.com/showpo...37&postcount=2

Try another version of LW & see if the same thing happens. The latest basic's 4.12.11 or there's a 4.13.2 Beta...just remember to use the offline installer. Delete your preferences folder again as well.

If that's no help then I'm sorry but I'm out of ideas