Thanks Birdy. I actually did go in and try to configure my XP firewall and everything looked good there, but when I tried to enable UPnP, that's where I got lost. I followed the instructions and did everything that I was supposed to do, but I never got the "finish" button. So, after I made all of the changes, I hit "ok" , but my computer never brought up the "Residential Gateway Icon" in My Network Places like the instructions said it would. Mind you, I'm not very computer savvy, so that's obviously a problem as well, so I apologize ahead of time if I say something that makes you say "uh, hello!!" Lol! I really appreciate your patience with me. I thought I followed everything exactly as I was supposed to. Maybe this is where the problem lies.

WinXP
Limewire: 4.12.3
Java: 1.5.0_07
Modem/router: I honestly don't know what this is? (This is where you get to say say, uh, hello!!)
ISP?
Connection: Cable from home
I am not sharing a connection with anyone
I've actually used LW for quite a while before experiencing this problem