If you are unable to access the Settings app, are you able to boot your PC into the Recovery Environment using these steps to uninstall the update that caused the problem from there.
Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt... etc.