can't boot the Live DVD in my pc (UEFI, windows 8 dual boot)

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http://askubuntu.com – I have a Dell XPS 8500 pc, with windows 8, and UEFI, I want a dual boot with windows 8 and ubuntu 12.10(64 bits) .. then I was reading the next tutorial: (add http)help.ubuntu.com/community/UEFI but just can't boot any live dvd, I have downloaded 3 times the ubuntu live dvd(in two differents places), and one time the ubuntu secure remix live dvd ( both in 64 bits). My bios setup is the next (screenshot): http://img90.imageshack.us/img90/7497/201211250051.jpg When booting my pc with the live dvd (only in the normal ubuntu live dvd) show this screens: first: (add http:) imageshack.us/a/img841 (HowTos)