Dave,
You could try this link.
http://www.ozcableguy.com/ There's a wealth of info there. If you're with Bogpond and have an Alcatel speedtouch router then you can browse the router for clues by typing 10.0.01.38 in IE. I have the same model Laptop and it works fine with ADSL. If you're using XP, the problem could also be the firewall. I'm a bit puzzled as to where you're reading the 100kbps from. Another thing to look out for is changing the initial username and or passwords on line. If you chenge them on line you also need to change them in your router otherwise it will not connect. I you want you can PM me and arrange a voice call, I may be able to sort it out easily over the phone in a couple of minutes for you.