I turned off my laptop once while it was doing an update and now it's showing that…
What should I do?
Do not switch off the laptop during an update in the future. Is the OS still operational? If not you have to restart windows.
I don't know how to tell whether the OS is still operational… I know about technology… 😅
Can you still use the computer normally after a restart or is that no longer possible?
It does not work anymore. The error message just comes back after the restart.
Then you have successfully shot Windows. What you have to do now is make a bootable Windows stick and try to repair the operating system with it. If that doesn't work, you only have the option of reinstalling Windows.