Hello Jay,
I had the same problem before, although my laptop-hardware meets all conditions I had this problem.
My issue was a second graphic card (HD 4000 integrated plus NVIDIA GTX 675 m). I shut down the nvidia-card, restartet my pc and so in a "HD4000-solo-System" the installation works. After that, the WiDi program found my adapter and i was able to restart my nvidia-card without problems.
Good luck
Jochen