Binary is verified by the vendor certificate?

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http://forums.fedoraforum.org – My new laptop (Dell Inspiron 14z) comes with preinstalled Windoze 8, and I can't seem to install Fedora on the damn thing. Fedora 17 CDs and DVDs gets recognized as boot media, but immediately after choosing that media to boot from, Windoze starts up again. If I however put a Fedora 18 DVD in the damn thing, it boots, but only to show the "Binary is verified by the vendor certificate." message. I've also tried booting from a USB key, but same message appears. I figure this must be my first battle with UEFI and 18 has an advantage over Fedora 17, but I still can't figure out how to mo (HowTos)