Factory pre-installed WIN8 to do XP or Win7, you can change the BIOS

(a) notebook computer:
Win8 Change Win7
Action Method 1:
1. When the logo appears, click F1 to enter the BIOS.
2, choose Restart-os Optimized Defaults, modify into disabled
3, click F9 (Edge Series Model Click FN+F9), select Yes
4, click F10 (Edge Series Model Click FN+F10), select Yes
5, the machine automatically restarts after the normal installation Windows7
Action Method 2:
1, Boot click F1 to enter the BIOS interface
2. Enter Security-secure boot-disabled
3, enter the startup-uefi/legacy boot option, there are two options
(2) uefi/legacy boot selected as UEFI ONLY,CSM Select Yes
4. After placing the Windows7 installation CD, click F10 Select Yes to save the BIOS settings and exit
5, the machine will automatically restart, then you can follow Windows7 installation instructions to install the operating system

(ii) Desktop:
Win8 Change Win7:
F1 into the BIOS, select startup, you need to open the CSM, boot mode to Legacy, F10 save.
Win8 Change XP:
Into the BIOS, first select the ATA Driver Setup in device and go in to change the hard drive mode to IDE mode. and then
Select startup, after the CSM is turned on, change boot mode to Legacy, F10 save