Use power button to shut down completely. Press power button and on booting up, before BIOS/UEFI options press and hold the power button again so it forces a shutdown again. Try a reboot and if it returns to the same scenario try again. Possibly the upgrade is stuck on booting. Hopefully on second or third attempt it will show a screen that Windows is updating and a percentage of the updating will show.
Your image that might help other to offer further help,