Google Chrome - Foro de ayuda

hola...se me metio un virus que afecta a google chrome -solo cuando quiero entrar a facebook, desde mi notebook-, me aparece esto...>

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Protege tu cuenta
Protege tu cuenta
It looks like you downloaded software that is affecting your Facebook account and showing you unauthorized ads. 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.

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.

If you would rather continue using this software, you may stop this process by clicking on "Log Out" in the upper right hand corner. Note that you won't be able to use Facebook from the computer where this software is installed.
 ..."protege tu cuenta"...

...y me envia a descargar un antivirus "mcafee"...que descargue instale...y no anda... y todo sigue igual...
-si alguien tiene una posible solucion a este problema, muchas gracias.-