Cant find my firewall....
 

My LimeWire states that is is being blocked by a firewall. I search my computer and looked everywhere and can not find my firewall. I do not have a router hooked up and i am using windows xp that i got from my brother in law. It is not registered, could that be the problem or do i need to change my ports and if i do need to change my ports how do i know what to change them to?

Please Help!!:confused:

How do i know what ports to change? how do i get the port numbers?