Backdoor Virus pop-up issue
I am experiencing a pop-up stating Back Door Virus Detected. This occurs intermitantly. I am using OS ver. 10.11.6, Chrome ver. 60.0.3112.101. I have cleared the browser history and cache. Does anyone have a suggestion to remove this pop-up.
iMac (21.5-inch, Late 2015), iOS 10.3.3