Check this out.
You Cannot Access Your MSN E-mail Account or Authenticate with a Web Site in
Various Programs
When you try to access your MSN e-mail account, you may receive the
following error message:
You cannot successfully authenticate with a Web site in various programs
(for example, Windows Media Player). For example, you may be prompted for
your user name and your password several times, and you may receive the
error message that is described in this section or an other error message
from the Web site that indicates that you cannot access even after you type
the correct user name and password.
http://support.microsoft.com/?kbid=813951 (i. e. 6. W98/se/NT4/W2000/XP
6/5/2003)
smyler said:
I downloaded the updates to WindowsXP this morning and now I can't get
into my Yahoo! Mail. It repeatedly asks me to enter my password. I can get
in, just fine, when I use Opera, but I hate to have to use a second browser
just for that purpose, since I always have IE 6 open.