Sometimes modern apps will not load or open, the icons disappear from the task bar and they don't respond to any tap/click or command. Resulting in some apps returning:
Windows cannot find ". Make sure you typed the name correctly, and then try again.
No troubleshooter or workaround will work. My current built of Windows 10 is 9879.
Update: Brink (eightforums.com admin) added the 15th step after I talked to him about the solution.