WinXP SP2, IE6 SP2 security flaw with password protected web sites

In Internet Explorer 6 SP2 I have my default web page set to Yahoo Mail's
web site:

http://mail.yahoo.com/

I can log in to my Yahoo e-mail account and successfully log out. If I log
out of Windows XP and log back in or restart Windows XP SP2 and run Internet
Explorer 6 SP2, my Yahoo Mail account gets automatically logged in.

I sent an e-mail to Yahoo Support and I have not heard anything back from
them.

I can duplicate this with my MSN Hotmail account too, but I rarely use that
account.

After further testing on a few web sites that I use that requires a login,
this same security problem occurs.

I cannot duplicate this problem in Mozilla Navigator 1.7.3 and Mozilla
Firefox 1.0.

I had other Windows XP SP2 users duplicate this same problem after
installing the latest Windows security updates from the Windows Update web
site.

This noticable Internet Explorer 6 SP2 security problem did not occur until
I installed these recent Windows XP SP2 updates:

http://www.microsoft.com/technet/sec.../ms04-038.mspx
Microsoft Security Bulletin MS04-038
Cumulative Security Update for Internet Explorer (834707)

http://support.microsoft.com/kb/886185
Description of the critical update for Windows Firewall "My Network
(subnet) only" scoping in Windows XP Service Pack 2

http://support.microsoft.com/kb/887797
Outlook Express for Windows update available

http://www.microsoft.com/windows/win...0/default.aspx
Windows Media Player 10