Virus named Macbook notified on Safari
I just received a message on my Mac stating that it had been infected by a virus and right after a kind of cleaning session has started, driving me to a page from what I suppose , is an Anti-Virus sales website, which I have never heard about. I've tried unsuccessfully to get some support at Apple website by my support has been expired. Since this is a Software issue, I don't know how to proceed and what would be the best action to take. I need some help to ensure my computer is clean of virus before I can use it safely again.
Mac Pro, iOS 10, 10.10.5 Yosemite