Originally Posted by birdy

Have you set up port forwarding, using your static IP address? Try changing ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 64049 > Apply > ok. You'll also have to forward this port number within your router. Remember that LW's listening port, port in the 'manual port forward' box & port forwarded within the router all have to be the same number.

Does LW connect on your Dad's XP computer? Yes, (or it did for a few months ago - haven't tried since)

Can you find out who your ISP is (who you pay for internet access)? My SMTP is pasmtp.tele.dk . Else I don't know.

Did you make sure that your Norton firewall was allowing LW? Yes I'm sure.
If you go back to the link I left in my first post, you'll see instructions for Norton 2007. This link might help, as well.
http://www.gnutellaforums.com/226610-post6.html