Windows 10 - DELL Re-Installation Guide: 1) Insert the Windows 10 USB and re start the machine 2) Turn on the machine and keep on pressing F12 3) A Boot Menu screen like this will appear: 4) Using the arrow keys on the keyboard, select the ‘UEFI USB Device’ option, you will know when it is selected as it will be highlighted in grey. Now press Enter on your keyboard. 5) Click next when greeted with this screen. 6) On this screen, in the right-hand corner select ‘I don’t have a Product Key/Skip’ 7) Please select ‘Windows 10 PRO’ and click next. 8) Accept the Licence Agreement 9) Click on the ‘Custom: Install Windows Only (advanced)’ option 10) Click on each partition and press ‘Delete’ on each one until there is only: ‘Drive 0 Unallocated Space’ , select ‘Drive 0 Unallocated Space’ and then click next. 11) The installation has begun. Usually, the installation will be done in 15 to 25 minutes. Your system might reboot twice or thrice during the installation. When your system reboots, don’t respond to Press any key to boot from CD or DVD or USB message.