Since you haven't posted back I'm guessing you are still having problems. I do have one long term suggestion for you that isn't going to help with your immediate problem but might be something for you to consider. Buy a router. There are 2 district advantages to having a router:
(1) Although my router installed without incident you may have to spend some time to get yours configured properly but once it's done you'll never have to do it again. Every OS I've installed found the network without configuration of any kind. There is no dialer to set up in the OS because the router dials your ISP with the userid and password automatically.
(2) Security. The router acts as a hardware firewall.
The following explains how a router acts as a firewall:http://www.grc.com/nat/nat.htm
A NAT Router's Inherent Security
Although NAT routers are not generally purchased for their security benefits, all NAT routers inherently function as very effective hardware firewalls (with a few caveats examined below). As a hardware firewall they prevent "unsolicited", unexpected, unwanted, and potentially annoying or dangerous traffic from the public Internet from passing through the router and entering the user's private LAN network.
The reason they do this is very simple: With multiple "internal" computers on the LAN behind the router, the router must know which internal computer should receive each incoming packet of data. Since ALL incoming packets of data have the same IP address (the single IP address of the router), the only way the router knows which computer should receive the incoming packet is if one of the internal computers on the private LAN FIRST sent data packets out to the source of the returning packets.
I bought my router ( DLink DI-604 ) when I only had one PC for about $12. Never had a problem configuring or connecting to my DSL ISP on any OS install since then. It was well worth the $12.