Help me understand. Are you unable to log on to your internet service? Are you logging on to your service first and then opening your browser (IE6 or Opera) or are you opening your browser and wanting to log on to the internet automatically? Either one is possible but there are some settings to change if you want to do the latter. I can maybe help with that.
I've never heard of logging on to IE6 or any other browser.
Most likely problem would be that you need to check that Cookies are being allowed, to find that you need to go to "Tools, Internet Options, Secruity tab, Internet (Custom levels), and scroll down until you find "Cookies"", ensure that these two settings are are enabled, you may have to login once but after that it should be fine. If that don't work try kicking it.
oh, further to that. Do you have a firewall, if you install IE6 after the firewall it may not be letting all the necessary programmes access the net to establish connection to the browser.