Mi face book me pide que instale mcafee

Hola, tengo un problema cuando quiero entrar a mi cuenta de face book me aparece una nota que dice que asegure mi cuenta y que descargue mc afee que es un antivirus pero yo ya tengo uno y o me da ninguna opcion y no me deja entrar a mi cuenta que hago ayudenme por favor
ESTE ES EL MENSAGE QUE APARECE
It looks like you downloaded software that is affecting your Facebook account and showing you unauthorized ads. We'll walk you through a few steps that will remove the software and secure your account.
It's common for people to be tricked into running programs that offer features that aren't available on Facebook, such as adding custom themes or seeing who has viewed your profile.
Y CAUNDO LE DOY ACEPTAR ME APARECE ESTE OTRO Y DESPUES EL DOWLOAD

What is Adware?

This software will show you spammy ads that aren't approved by Facebook. They can also introduce security vulnerabilities, slow down your computer, and clutter up your news feed with ads so that you end up missing content from your friends.