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.)?

Go here & tell me what happens: http://www3.limewire.com:6346/ (it should say test page was a success.)