There are three ways to turn Narrator on or off:
In Windows 10, press Windows logo key + Ctrl + Enter on your keyboard. In earlier versions of Windows, you may need to press Windows logo key + Enter.
On the sign-in screen, select the Ease of access button in the lower-right corner, and turn on the toggle under Narrator.
Go to Settings > Ease of Access > Narrator,and then turn on the toggle under Use Narrator.