Strange things happening

[Axbrewder]

Hi there!

It's a little bit embarrassing for me to admit this but I actually can't get Phex to connect to anything. And the most embarrassing part of this is... I've been using it since 2005!
Something like this never happened. I thought it might be time for an update, so I installed 3.0.0.99 (while the old one was still on my computer) and wanted to run it as always but after a couple of seconds every remote host has this flashing up behind him: Error. Connection refused: connect
I tried to change the listening port but this wouldn't work.
I have a router and tried to open a port for the Gnutella network but this doesn't work either.
Now, as far as I remember everything went rather smooth when I first installed Phex almost two years ago. I didn't change anything then and there and even the router wouldn't complain.
So now I would appreciate it very much if anyone could help me out here.
Thanks in advance...

Oh, yeah, almost forgot:
My operating system: Windows XP
Version: 3.0.0.99
Connection: DSL
Message: Error. Connection refused: connect
Others: I have a router but this was no problem in the past