Yes we're trying to help but you're not making it easy!! Please, if you could answer these questions

Do you see the firewall icon?
What are the brand & model numbers of your modem & your router?
Was this the test you referred to http://www3.limewire.com:6346 ?

You'll have a preferences folder.
If it's not here C:/Documents and Settings/your name/Application Data/LimeWire then it will be here C:/Documents and Settings/your name/.limewire
The green location is for newer versions. The App Data folder is hidden, so in order to see it you'll have to show hidden files & folders (within tools > folder options > view).

I'd be interested to see what happens if you have a friend with a laptop, they brought their computer to your house & plugged in, whether they'd be able to use their LW at your place. Has anyone ever done this?