Was this the thread that you went through for fixes? If not, go through that one & see if anything helps.
If LW Will Not Connect

Did you try deleting LW's preferences folder? Remember that LW has to be properly closed first, or it's a waste of time. Also remember to look for a prefs folder in the old location (within Documents and Settings). After you deleted the prefs folder, did you have to go through the LW setup wizard again?

Did you try updating and/or installing an older version of Java? Remember to only have 1 version of Java installed at a time.

When you replaced the gnutella.net file, was LW properly closed? What size is the gnutella.net file that you have installed now?

If you're stuck, please post your system details (the link above has info about that)