How do you lock and unlock a Windows computer?

Method 1: From any screen, press the Windows Logo + L key combination to immediately lock the computer. Method 2: From any screen, press the CTRL + ALT + DEL key combination and, from the options menu, click Lock this computer.

How do I lock my computer myself?

By pressing the Windows key and the L key (Win+L), you can quickly lock the laptop, temporarily logging yourself off Windows. Only by logging in again — which requires you to type your password — can you regain access.