Hello i have a problem whith the setup, in the last step the wifi extender crash but its still working its just disconnect from the laptop here is a pic: http://i.imgur.com/Ythsa7O.png
unplug everything and wait 30 sec then plug everything back in. Your DNS server is not giving the address. If it's still not working then you have to go to windows start>Run>CMD. Enter ipconfig /all and look at whats happening, but I would blackout your external ip if it shows up.