Older tech support story, but still a frusterating one.

Sister was running Windows 8.1 (ew) when Microsoft was ramming Windows 10 down everyone's throat.

Her laptop decided to update to Windows 10, and after waiting awhile, she decided to unplug the laptop's battery and power chord.

This did what you expected, corrupted her install, leading to a bootloop. I then got to deal with that to try and recover it.

Once I got into the recovery mode, it wanted her password to restore from a system image, guess what she forgot?

She tried her PIN, and gave up after a few attempts, and I got to reinstall Windows for her.

Lesson learned from this? If you're the IT person of the house, make sure that you have an account on all machines that you may administrate. That way you don't need to deal with this shit.