How to Downgrade Windows 8 Preinstalled to Windows 7
This tutorial will show you how to downgrade your Windows 8 Preinstalled with or without Secure Boot to Windows 7.
1) Open an elevated Power Shell in Windows 8.
2) Type confirm-SecureBootUEFI
If TRUE, your uEFI BIOS is set to Secure Boot, go to step 3 below.
If FALSE, your uEFI BIOS is not set to Secure Boot, NO need to reset uEFI BIOS. Go to step 4.
3) Reset BIOS to default, and reboot to BIOS make sure Secure Boot is disabled.
NOTE: Check your manufacturer's uEFI/BIOS firmware manual for settings.
4) To boot your DVD, use one time boot menu
5) press enter on the UEFI DVD drive
6) Follow this tutorial:
A) Delete all partitions. (in Drive Options)
B) Remake partitions. (in Drive Options)
DO NOT ENABLE SECURE BOOT AFTER INSTALLING WINDOWS 7, WINDOWS 7 WILL NOT BOOT.
When dual booting with Windows 8 Preinstalled & Windows 7
Follow Step one to five in this tutorial: Downgrade Windows 8 to Windows 7
Before making the partition for Windows 7, delete the OEM Recovery partition at the end of HDD drive.
If you shrink C: before deleting the OEM Recovery partition, the C: & the new partition may be converted to Dynamic partitions.
Than follow this tutorial: (installing in uEFI mode.) Dual Boot Installation - Windows 8 and Windows 7 or Vista