You can turn/off narrator with these step by step process:
Step 1: Click on the Start button and in the Start Search box type: Ease of Access Center.
Step 2: When the Ease of Access Center icon appears at the top of the Start Menu, click on it to open.
Step 3: Under Explore all settings, click on Use the computer without a display.
Step 4: Remove the check next to Turn on Narrator and click Apply . (If off)
Step 5: Remove the check next to Turn off Narrator and click Apply . (If on)