Let's go thru the specifics.

Can you give us a total desciption of your set up:
1. What firewalls you have?
2. How much ram?
3. Hard Disk space available?
4. Connection type? (eg: dialup, broadband, cable, etc.)
5. Modem & router brand name & model numbers?
6. Where are you trying to connect from (home, school, work, etc.)?
7. Who is your isp provider?

Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there?