Memory <=4g, select 32-bit (x86) memory >=4g, select 64-bit (x64) (not required)
BIOS setup
USB Boot support disabled to Enabled (if loaded with a USB flash drive)
Boot Mode Uefi changed to Legacy
1st boot Device set to USB Storage Devices (change back to default HDD Devices, hard drive boot)
After booting into the PE system via USB stick, use "Partition tool" to convert the partition table type of the hard disk into MBR format, then re-partition, then install the Win7 image to C drive through the installed tool ... Ok!
The following information from Baidu know
http://zhidao.baidu.com/question/559576431609596444.html?qbl=relate_question_3&word=win8%B8%C4win7%D2%AA% B8%c4%c4%c4%d0%a9%c5%e4%d6%c3
Because the motherboard now supports the new UEFI BIOS, in this mode, only GPT disks can be used to install the 64-bit Win8, and the 32-bit operating system cannot be installed. Of course, installing 64-bit Win7 is fine, but 64-bit Win7 support for UEFI is not as perfect as Win8. Therefore, if you want to install a 32-bit operating system, you must turn off the UEFI bios in the BIOS, instead of the traditional bios, because the traditional BIOS does not support the installation of the operating system on the GPT disk, it is also necessary to change the hard disk to the common MBR mode, in order to install 32-bit operating system.
So, if the notebook is preloaded with a 32-bit operating system, then the motherboard must be a traditional BIOS, no need to change to install any 32-bit or 64-bit operating system. However, if the 64-bit Win8 is preinstalled, it is likely that the new UEFI BIOS is enabled and the hard disk is changed to a GPT disk, which is required to change to a 32-bit operating system:
1. Turn off the UEFI bios and enable the traditional BIOS (display the Legacy BIOS in the BIOS);
2. Change the hard disk to MBR disk (this requires deleting all partitions on the hard disk).
Win8 Change Win7 Notes