I've tried a lot of these suggestions and nothing has happened.
The thing is, when I start Limewire, the "Limewire has detected a firewall" icon comes up in the bottom corner of the screen even when I turn my windows firewall off. I don't have any other firewall running as far as I know. My PC was attacked by a trojan a couple of weeks ago, and I'm convinced there is a connection, even though I effectively removed it.

Can anyone tell me a way on Windows XP to check what the firewall could be on my system that Limewire is detecting? Because it definitely isn't Windows Firewall.