2.8.8 CSM (Compatibility Support Module)
Allows you to configure the CSM (Compatibility Support Module) items to fully support the various VGA, bootable devices and add-on devices for better compatibility.
Launch CSM [Enabled]
For better compatibility, enable the CSM to fully support the non-UEFI driver add-on devices or the Windows® UEFI mode.
2.8.9 Secure Boot
Allows you to configure the Windows® Secure Boot settings and manage its keys to protect the system from unauthorized access and malwares during POST.OS Type [Windows UE...]Allows you to select your installed operating system.
[Other OS]
Get the optimized function when booting on Windows® non-UEFI mode, Windows® Vista/XP, or other Microsoft® Secure Boot non-compliant OS. Only on Windows® UEFI mode that Microsoft®Secure Boot can function properly.
http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/H81I-PLUS/E8425_H81I_PLUS.pdf
Wenn man das da im Bios einstellt = UEFI deaktiviert braucht man das normalerweise nicht zu machen.