The models I used mandate we create the SmartHub account and login before the web browser and apps work. Since you can't login, call Samsung NOW and have them work on that issue.
I have just bought Samsung 40UE5300 tv. It got connected to wifi after couple of tries but now it is not opening web browser or any other app. Even tried to login with samsung id for downloading apps but it is not loggin also. Thrice I have reset Tv but problems not sloved.