Which version of LW are you uisng?
Are your Pro benefits still current (ie can you still download Pro for free)? If not, do you have the Pro installer saved?
When you reinstalled Java, did you remove all other Java versions installed before installing the latest version?
For now, try deleting LW's preferences folder when LW's properly closed. This thread has more info & a link for Vista users:
http://www.gnutellaforums.com/window...ng-should.html
Otherwise, check post & 4 of this thread:
http://www.gnutellaforums.com/connec...onnection.html
If you have time before LW crashes, try some of those fixes.