"add a wireless display" missing windows 8.1

Hi Steve,

We apologize for the inconvenience caused to you.

Generally, if your PC came with Windows 8.1 and your wireless display supports Miracast, you’re ready to add the wireless display to your PC to complete the connection, and start projecting.

However, if you upgraded your PC from an older version of Windows, you'll need to make sure your PC supports Miracast and is ready to project. Also, if the display you'll project to doesn’t support Miracast, you’ll need to set up the display by adding an extra piece of hardware to it before you can start projecting.

I would have you add the display to complete the connection. 

Follow these steps to add a wireless display to your PC:

1. Swipe in from the right edge of the screen, and then tap Devices.

(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Devices.) 2. Tap or click Project, and then tap or click Add a wireless display. 3. Choose the wireless display in the list of devices found, and follow the instructions on the screen.

There are few suggestions to fix the issue. I would have you refer to the section “Fix problems” from the following link and see if it fixes the issue.

http://windows.microsoft.com/en-us/windows-8/project-wireless-screen-miracast

If there are no Windows 8.1 drivers, you may refer to the link and install the drivers in compatibility mode.

**Make older programs compatible with this version of Windows**

For more information, refer to the link.

http://blogs.windows.com/windows/b/windowsexperience/archive/2013/11/12/windows-8-1-on-your-big-screen-with-miracast.aspx

Keep us posted on the status of the issue. We will be glad to assist you.