Note: If you have dismissed the dialog, use the hotkey CTRL + Windows + N to access the Narrator settings. Next, you should proceed to the Choose a Voice combo box and then click the button that says "Show All Settings" just below the combo box.The Add button, which is displayed after the speed, pitch, and volume options for the presently selected voice, can be activated from here.

Installing and using add-ons. If you're missing an add-on that you need to view a page, Internet Explorer will let you know, and will prompt you to install the add-on.