ATT Yahoo is my ISP so I did do the install from them.  If there was a check box for an additional toolbar I did not see it.  I will have to uninstall it.  This has been an aggravating lesson.  One additional odd thing is that everything slows down dramatically after a few internet sessions.  I have done nothing different than before.  Running CCleaner speeds everything back up, even though it does not remove much.  Microsoft Security Essentials can not find a virus, so I think it must be related to the upgrade.