unexpected disconnect

I recently updated my internet explorer, and ever since
that time, whenever I log on to access my e-mail I click
on the e-mail tab on the ATT home page. When I do that I
get a security box stating that I am entering a secure
area. I click OK, a few seconds later my internet
connection is terminated, and I recieve the standard site
not available message.

At that point I reconnect. After the connection is
restored I click the "go" button on the navigation bar
and it continues the e-mail log in process normally.

How can I fix this?

Lowell