All of you, try the advice here: http://www.gnutellaforums.com/connec...t-fix-try.html
Start off by deleting LW's preferences folder & changing Java versions.

In case you have Vista, things are a bit different to XP when finding the preferences folder & other files/folders within Application Data. This thread should help with that: LimeWire Pref Folder in Vista

If nothing there helps, please give us your details.
System details - help us to help you -> Provide these details when you post!!!