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.)?
These details are vital if you want us to find out what your connection problem is.

A. Update your Java: http://www.limewire.com/english/cont...radejava.shtml

B. Try deleting your LW preferences folder called .limewire & found here: C:/Documents And Settings/your_username/.limewire (you should make a note of all your settings 1st b/c once you delete this you'll need to reset them.)

C. Go to Control Panel then Add/Remove Programs & click on Limewire on the Change/Remove button & it comes up with options and one of them is Repair. Try this.