I have the same problem. I clean-installed 10 from the beginning and have never tried an upgrade from 7 or 8. I want to keep 7 and have 10 dual-booting like I do now. But a non-upgrade reinstall at...

Thanks Warkratos, that worked perfectly. I also have been having this problem and re-registering/sfc/dism didn't do anything.

Now that you mention it, I think I have. I did a System Restore yesterday and all of the Modern apps except Settings and (I think) Spartan broke. I got errors about app integrity in the Event Viewer....