@arthurneely​ Ignore it! All I did was restore my browser to default values, and that pop-up was gone. Whatever you do, don't click on that pop-up.

I don't know when or how it happened, but all of a sudden I am getting this popup purporting to come from McAfee with an error message saying that "your computer is damaged by suspicious programs. To remove virus, click here." Of course, I haven't clicked anywhere - this is obviously bogus. But how do I stop or uninstall this? I've run a full scan with Trendmicro, and that didn't reveal ahting.