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DownGrade Windows 8 Pro 64bit on HP 4540s Probook to Windows 7 Pro 64 bit

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  1. Reboot the computer for Hp proobook
  2. Press F10 in order to inter in a Bios setup.
  3. Click on "System Configuration"
  4. Scroll down Till the Word"Booting Mode or Mode Boot:u will see UEFI
  5. Click on it then move by using Up and Down arrows
  6. Select the Word "LEGANCY'
  8. Restart the computer press F9 quickly
  9. Then select the First booting "Optical Media Mode"
  10. Now u can install Window 7,but make sure you emmpyt your Sata HDD and creat your own partision.