If you are having issues accessing secure sites with IE and XP SP2 the general troubleshooter is here:
One issue that has surfaced is that users of the Google Toolbar will have issues if the "AutoFill" option is enabled. If you are having problems with authenticating to a Secure Site and are using the Google Toolbar, use the Google Toolbar Options menu to disable AutoFill.
One issue that has surfaced is that users of the Google Toolbar will have issues if the "AutoFill" option is enabled. If you are having problems with authenticating to a Secure Site and are using the Google Toolbar, use the Google Toolbar Options menu to disable AutoFill.