Had a small issue trying to install Windows 7 Pro on DELL Latitude E5430 laptop that originally came with Windows 8. Using DELL original Windows 7 Pro installation DVD.

First issue was that Windows 7 Pro installation DVD would not boot. This one was easy to resolve. Simply load DELL BIOS and disable Secure Boot feature.

After this Windows 7 installation would boot from a DVD, load some files and then got stuck on Starting Windows logo. This one was resolved by enabling Legacy Boot option. On DELL Latitude E5430 this can be done following way:

• As soon as DELL logo appears press F12 to load a Boot Menu
• In the Boot Menu choose the last option - Change Boot Mode Settings
• In next screen choose option - Legacy Boot Mode, Secure Boot OFF
  
  
• Confirm changes on the last screen
  
• After this computer reboots and Windows installation should work fine