The Visual-Guide shows you Step-by-Step How to Easy Installing a Mageia Linux 2 GNOME3 Desktop on a PC with Windows8 Pre-Installed/Uefi Firmware Disabling Win8 Secure Boot.
The First, Need Step Consists in Disabling the New Windows 8 Secure Boot that Impede the Boot from Installation Media CD/DVD.
The Initial Pre-Installation Step of Preparing the Installation Media CD/DVD for Installation is Skipped if you Need Consult the Online Documentation.
To the Post Bottom you Find also As a Bonus Link to How to Create an App Launcher on Mageia Linux Desktops.

Windows 8 Disabling “Secure Boot” and Enable Boot from CD/DVD:
Win8 CD/DVD Boot SetupBoot from Installation in Mageia Media.
Choose Language.
Accept License.
Set Timezone.
Set the NTP Server.
Set Date, Clock & Time-Zone.
Choose Keyboard Layout.
Start Installation Wizard.
How to Make a Custom Partitioning for Performance on Mageia.
Custom Partitioning Visual-GuideRemove Unused Packages.
Wait Until System is Installed.
Set-Up Bootloader Installation.
Possibly Edit Boot Menu.
Set-Up Passwords & User.
Create a Mageia GNOME3 Launcher for Easy-Starting: