Microsoft Edge Protection ALert

Spent the past five or six days trying to sort out the Free screwed-up Windows 10 upgrade.

It was bjm_ who advised me why using Edge would be a problem so I spent some time getting IE11 back and having it as my default browser.

But just now, my wife wanted to use the laptop. I hadn't sorted out her profile so I got all the MS claptrap before getting to her desktop. No problem there except I couldn't make IE11 her default browser - I intended to sort that out tomorrow but when I came back to my profile I found this blasted message:

snip - Norton Edge alert 2015-12 28th.PNG

It's in the bottom right of my screen,  I can't shift it so I can't get to the top right of the window to close it. Any suggestions how I can close it? And why does it say that Edge is my default browser when in this profile it's not? 

Happy & Healthy New Year!