1. Create a Windows 10 bootable USB drive
  2. Delete the encrypted drive partition
  3. Change the boot sequence and install Windows 10

Step 1 – create a bootable USB drive.

Ensure that you follow the instructions provided on the articles – simply dragging and dropping files to your USB drive will not result in a bootable drive

In order to create a Windows 10 bootable USB drive, you will need to use a different computer (not your Dell, unless of course the computer you already own is also a Dell).

Select your current OS below for specific instructions:
macOS / Windows

Step 2 – delete the encrypted partition.

You can complete Step 2 while waiting for Step 1 to complete. 

Part A:

Follow this tutorial to access Command Prompt via the Windows Advanced Recovery Options when booting:

Part B:

  • With Command prompt open, type: diskpart
  • At the diskpart prompt, type: list disk

Then, all the disks on your computer will be list, you should figure out the disk number of the disk from which you want to delete the partition.

  • Type: select disk n

n is the disk number. Select the disk which contains the partition you want to delete – will most likely be the largest disk – close to 476GB.

  • Type: list partition
  • Then, type: select partition n

n is the partition number. Here you need to select the partition which you want to delete – will be one of the ‘Primary’ type partitions, the partition closest to 500GB.

  • Type: delete partition

Then, delete partition using Diskpart will be shown as the following screen shot shows:

  • Type: exit – once to exit the diskpart utility, and then again to exit Command Prompt.

Step 3 – change boot sequence and install Windows 10.

At this stage, your bootable Windows 10 drive should be created.

Go ahead and plug your newly created boot drive into your Dell.

Follow this tutorial to change your Dell’s boot sequence and load the Windows 10 installer from your USB: