I booted into safe mode and it is not functioning.
Safe Mode on Windows 10 doesn't seem to work very well at this point, however:
Normally in safe mode in windows 10 you can still launch taskmanager by using Ctrl + Alt + Delete
From there you can go to the file menu and choose run new task and type
msconfig
and you should be able to change your settings from there.
Let us know if that works
Not functioning could mean a lot of things....
Not functioning at all? Or limited functionality?