NOTE Prerequisite:  A valid service tag with entitlement to the preferred Windows OS.  .e.g If looking for Windows 10, then the service tag must show sold with Windows 10. 

1. Go to:  http://www.dell.com/support/home/us/en/04/Drivers/OSISO
2. Input valid Service Tag & Verification Code then click Submit.
3. Click the link to Download the recovery image.

After you download the Windows recovery image file, follow the instructions below to create a bootable USB drive or DVD.

• How to create and use the Dell Windows recovery image