Safari virus notice freezes browser
When I open Safari or click on a link in my email on my Mac, the browser plays a loud siren and a pop-up reads "http://app.macoscleaner.com VIRUS FOUND The last website you visited has infected your Mac with a virus. Press OK to begin the repair process." I have NOT pressed OK because I do not want to download anything or proceed in a way that might unleash Malware. Also, the browser is frozen. I cannot move to another tab or proceed to a website at all.
If I need to install an antivirus to take care of this, what should I do? which one?
I have used Safari on Mac laptops since it was introduced. Never had this happen. My MacBook Pro 15" (early 2011) is running Yosemite 10.10.3.
Thank you for your help.
Lynne Culp
MacBook Pro, Mac OS X (10.7.2), 2.2 GHz Intel Core i7