From Dell Windows 10 DVD/USB Media supplied with the system.

Note: The Dell Recovery media that ships with the system will look for specific partition information on the drive. If that partition information is missing then this media will not successfully install Windows 10. See the Windows 10 options below:
  1. Start the system while tapping F2 key to enter the BIOS
  2. Change Boot List option to Legacy from UEFI
  3. Then Change boot priority - Keep Internal Hard Drive as primary Boot Device/First boot device
  4. Then change the Boot List Option from Legacy to UEFI navigate to Advanced Boot Options, confirm the Legacy Option ROMS is checked / "Enabled", Secure Boot Option Disabled
  5. Navigate to Exit and "Exit Saving Changes"
  6. Reboot and use the F12 boot menu option
  7. Choose UEFI DVD/USB boot option then press the Enter key
  8. Dell Screen will show for a few momentsNote: You may experience a delay (1 to 5 minutes) to boot to the Dell Screen with Spinning Circles.
  9. You will see a prompt "Press any key to boot from CD or DVD..." press the Spacebar to continue.
  10. When prompted, choose your language (English is default)
  11. Choose your region (US Default)
  12. Choose Troubleshoot
  13. Choose Recover from a drive
  14. Choose either "Just remove my files" or "Fully clean drive"
  15. A pop up will appear, click the Recovery button
  16. Dell screen – will show "recovering this PC XX%"
  17. The system will Reboot to Windows 10 when the installation is finished
Note: You may encounter an error message due to the BIOS SATA settings associated with the CDROM. Generally, this error can be ignored by clicking Continue and Windows 10 will correctly install. Alternatively, you can temporarily disable the SATA ports in the BIOS that aren't hard drives and re-try the installation.