Kevin got an Amazon Fire TV Stick for Christmas and he's having issues connecting to it using Miracast in Windows. Leo says that Miracast is a Wi-Fi technology that essentially sends HDMI over the air. Android 4.2 or newer has it built in. Windows 8.1 also natively supports it.
The chatroom says it's also in Windows 7, but it's not very reliable on Windows and it may require a particular video card. Kevin should make sure his video drivers are up to date. Leo recommends checking out this article from Paul Thurrott at WinSupersite.com about it.