Did you uninstall Java & reinstall that? Otherwise, have a look at LOTR's advice about downloading the "other" version
http://www.gnutellaforums.com/showth...or+for+writing

You might also find some info here
http://www.gnutellaforums.com/showth...or+for+writing

*You can search through old threads by using the search button (top right, between faq & home)