THANK YOU!
When pop-up appeared on web site, I pressed "x" then "leave page", then turned off modem, computer, uninstalled Chrome, ran Avast boot-time scan, ran "clean-up". reinstalled Chrome, re-ran boot-time scan. Posted msg to you.
Really appreciate your help.
DO I NEED TO WORRY ABOUT OTHER LAPTOPS, TABLETS, PS4, on home Network?
Sons doing final year 12+10 exams, so have been using internet for study, last exam tomorrow.
regards
Chris (full 12 hour day at work, home 8pm Aust EST)