Hello JonRabka,
My Name is Paul one of the Community Advisor and a Microsoft Consumer like you. Miracast as an application for smartphone to be able to cast the screen to a television with an Active Network and there's no application for Windows.
If you are unsure of what you accidentally uninstalled earlier you might need to perform a system restore instead to go back to a specific date and time where you remember that the program is installed.
* Click START and search and open rstrui.exe and press enter.
* Follow the on screen process and select a date that you remember that the program is installed and that will bring the application back.