security update

I am getting this message constantly popping up. How do I get rid of it?
security update critical AOL has identified......

MOVED YOUR POST to the correct place. I would install malwarebytes and run a full scan after you update the definitions.

I'm sorry. I'm lost! please find me. what definitions update? and what is malwarebytes?
this message from AOL is PMO!

you can download it from here http://www.download.com/Malwarebytes...-10804572.html

Phishhead is right. That's the first tool to use. Just download, install, update & scan your computer. Let the program fix whatever it identifies as definitely bad.

You may have been infected by either the "Sunshine" virus or "Antivirus 2009".

Hopefully MalwarebytesAntiMalware will resolve it.

Please post back and let us know how you get on.

If you still have problems there are other tools we can use.

Let AOL update itself, it should do it after you close and reopen it.

I see by the age of this post it probably already did that.