I am using W10 and the Edge browser.
When I ran Edge today, it came up with a page showing I had a bunch of viruses and a Popup saying I had to call and 800 number or I would lose all my private data. Nothing seemed to work, so I opened task manager and crashed Edge.
Starting Edge came up with the same fake virus page. I crashed it again.
I ran Avira and SuperAntispyware; neither of which showed anything.
I ran Glary Utilities to clear my tracks, but that didn't help.
But then Glary offered to do an update, and that opened Edge to a real webpage!
That allowed me to open Edge Settings.
I changed my "open with" from custom to start page. That fixed the problem.
My theory is that something changed my start page to that virus/popup page.
(I wish I had looked to see what the custom page was, but I didn't.)
If so, then how do I fix it if it happens again. I got lucky this time because Glary opened a page; but I might not get lucky next time.
If that isn't the problem, then what might it be?