Install problem on UEFI, Windows 8 new desktop

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http://askubuntu.com – I just bought an HP desktop, p6-2326s, which has windows 8 installed. I have tried booting a Ubuntu live disc but the machine won't boot it. When I bring up the UEFI boot menu it offers a selection of UEFI BOOT SOURCES, windows boot manager, dvd drive, IP4 Ethernet controller, or IP6 Ethernet controller. If I select the dvd drive with the CD in it I get the message "Secure boot violation, Invalid structure detected. Check secure boot policy in setup." With all other selections it just boots into windows. So where do I go from here? (HowTos)