Goto your Control Panel in the Start Menu, then 'Network and Internet Connections', then 'Internet Options'.
Click the Connections tab and see what connection settings have been selected.
Personally I used to use the "Never dial a connection" when I had dial-up. It stopped rogue dialers that sometimes used to slip through my computer security defenses from dialing a connection to some premium telephone number when I wasn't looking, and costing me a lot of money.
Then I had a shortcut for the Dial-Up Network, (DUN), on my Desktop and I would use that to connect to my ISP before opening my browser. I felt more in control then.
Until recently when I was opening my Firefox my dialup connection window was coming up, I then was pressing "dial" and that was it. For a few days now this window doesn't come up and I have to bring it myself up separately, connect and then I open the Firefox. The same happens with my spam fighting Mailwasher and the IE7. How can I make this dial window appear again after opening my browser?
Any help will be greatly appreciated.