Please open the file
and remove anything except
gksudo gedit /etc/network/interfaces
Save, close the editor and reboot. This device maybe only supports WEP and WPA encryption, not WPA2. Which of the networks shown is yours? Please show also
iface lo inet loopback
Your router firmware is up-to-date? Channel "fixed", bandwidth to 20MHz, MAC-address filter is off and the network is not "hidden"? Check you router manual for applying these settings.