Launcher doesn't work

I can get into Launcher fine but when I click "play" and it goes through and takes me to the Mojang pop-up screen, it freezes at this point. Won't go forward and eventually says not responding. Won't go any further than this - 

 

Trying to close the screen, the following appears - 

 

 

Finally, it gives me this when I close the program from the pop-up -