Remember login information in Explorer 7.0

Hello, I am using a pc with WindowrXP Professional and IE7. I use ATT as my main mail account, the computer defaults to the standard ATT webpage, but not to My/Att webpage, even though I have made it my default page over and over again after logining in. It just doesn't want to open in My/Att login page, it always defaults to the ATT general page. The system remembers my name login information for every other application; bank, login to company computer, etc, insurance, etc. Any thoughts would be appreciated.