1, press the Notebook power button, and then keep pressing the F2 key to enter the BIOS operating interface. Select its direction on the keyboard and right-click on the security (Chinese meaning safe, safe) option to find secure BOOT control, change the enabled to Disabled, The purpose of this step is to turn off Microsoft's secure boot, which will lead to the inability to identify the USB disk boot system installation.
2, press Esc key back to the BIOS main interface, switch to the boot tag, the launch CSM to Enabled (if it is gray can not choose, first press F10 to save the exit again into the choice), the role of this option is to change the UEFI BIOS to the traditional BIOS mode.
3, the last keyboard function key press F10 to save and exit, reboot. When the boot button is pressed ESC to call the boot menu, you can change the startup item, and then you can install the system.
Summary: The above is ASUS notebook pre-installed WIN8 change Win7 detailed tutorial, I hope that members of the network after reading the full article, the ASUS notebook BIOS interface other hidden functions and information more understanding, so that when you install the system to their friends or colleagues can reduce some unnecessary trouble