How to lock in your free Windows 10 upgrade and keep using your old Windows version The year-long free upgrade offer for Windows 10 ends on July 29. But what if you're not ready to upgrade yet?

You can change the lock screen on your Windows computer by customizing the background image and specifying what supplemental information it displays.

However, by setting up a PIN lock, you can unlock a single device without routinely using your account password. A PIN is only used to unlock the device you activate it on.

You can change your Windows 10 login screen through your device's Settings app, and make it display any photo you like.