Odd, suddenly IE 11 won’t open when clicked in the Windows 8.1 Start Screen. I don’t recall making any changes, but somehow a setting in the Internet Explorer 11 got modified so that only the client IE 11 will open if I attempt to start the one in the Start Screen, which I prefer as it works so well with touch input.
So here are the screens you need to deal with to fix it, you have to close IE 11 to get it to work. In fact you might need to restart your system, which if you have a SSD is really painless (make sure to scroll down to see all of the images):
|Start with this one from the “gear” on the client IE 11|
In the Opening Internet Explorer use the drop down arrow and change it to:
Let Internet Explorer decide
Then click the Apply and then OK