Hey...another sandgroper

Start off by following LOTR's advice in his first post here
http://www.gnutellaforums.com/showth...ight=wont+open

That is, delete your preferences folder first (remember, it's probably in a hidden folder so you'll have to show all hidden files & folders to see it).Then uninstall your Java & reinstall using the offline installer. All the info's there, just follow the links & take your time

See if that helps. Otherwise, there are more steps you can take within that thread.