Ok...I'll be the poor soul that will give it a go..
Lets start with what sort of Operating system you are using...
Is it XP or Vista ??
Your modem/router is the little black box that connects you to the internet, if you look underneath it, it will have what the brand is and the model number...
Is your computer at home/school/work ??
What version of Java have you got on your computer...You will find this out by going to Start > Control Panal > Add/remove Programs and have a look at what it says...
Who do you pay to have the internet on ??
Do this simple test for us. Click on this link
http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What does it say?
Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? Click on the link to see what you need to be looking for..
http://www.gnutellaforums.com/attach...ection-lwb.gif
What security programs are you using (antivirus etc)? Some people might not be aware that their security suite includes a firewall...
What country are you living in?
Ok that's the important questions you really need to try and answer for us, so we are able to see what is wrong with your limewire...