archinator

I had this same problem trying to configure my girlfriends mail
account. I then check her mail settings in Yahoo! and after going
into her Yahoo! Mail Account, I clicked on "Options", then selected
"Mail Options". This loaded a new screen with some new options, I
then selected "POP3 and Forwarding" and then clicked on the "Set up or
edit POP & Forwarding" hyperlink. On the POP Access and Forwarding
page I selected the radio button next to "Web & POP Access" and
clicked on the Save push button to update the account settings.

Windows Mail then loaded on Vista with no further errors.

I am not sure if your problem was similar to this.