Did you configure your firewalls to allow both LW & Java full access: http://www.limewire.com/english/content/firewalls.shtml

Do you have XP SP2?

Can you give us a total desciption of your set up: 1. OS version,
2. What firewalls you have,
3. ram, 4. HDD space available,
5. Connection type,
6. Modem & router brand name & model numbers,
7. Where are you trying to connect from (home, school, work, etc.)?