From chicken to president is quite a promotion indeed! However, by respect, if your real initials, I would prefer referring to you as PFK.
The reasons why I suggested to you to upgrade to IE8 is that you may receive better security support from Microsoft when you do your regular Windows updates. The second is that the installation may repair you Yahoo homepage default settings.
Finally, if the upgrade does not repair it, I would suggest to you that you sent me the link to your Yahoo Homepage I will try to edit the registry.
Being in Canada, I do not have access to Yahoo USA or anywhere else in the World.