Hi.
Before I updated Windows I could use Widi to stream from my Samsung laptop to my samsung smart-tv, but after I have updated to Intel Wireless Display which is incorporated into windows (No app anymore), and follow the guide to connect for the first time, I can find the tv but can't connect through Widi. You should be able to connect with the tv and get a pin-code, but I can't get it up on the tv. Before the Windows update, there has been no problems connecting the pc with the tv through the Widi app.
Specs:
Laptop: Samsung NP900X4D Intel Core i5-3317U 1.70 GHz 64 bit
TV: Samsug UE40D7000
Looking forward hearing from you!