How to unlock Windows if you blocked your PC with "Windows + L"
Have you accidentally locked your Windows PC (maybe trying some keyboard shortcuts such as "Windows + L") and don't know what to do?
If you pressed "Windows key + L" to lock your PC, a password prompt will be shown for your current Windows user. The straightforward way to unlock your PC is to input your current Windows username and password. Entering the login data from another user with Windows admin permissions will disable the Windows lock too.
But, if you activated this Windows keyboard lock by accident, and you don't remember having specified any password related to your current user, don't panic! If you never defined a password for your active Windows user, just leave the password field empty and click "Accept": that will unlock Windows for sure.