I'm not a tech, so here is what I did. In Windows 10, go to top right menu button, click options, it will tell you what your default is. I thought I had re-set to IE, but nope. So down to window in bottom left, settings, system, default apps, web browser, select one, finish. It is a longer process but evidently the quick little click click in Control Panel no longer works. So it's really a two step process to re-set to IE or Firefox or whoever. We mainly geocache, and those are the two best browsers for that. But that's just us.