Why won't windows install

I will suggest you to check the BIOS settings provided below to see if you have similar settings. If not you may try these settings and then install the operating system.

• Go to the BIOS screen by pressing F2 at the Dell logo 4-5 times.
• Navigate to ‘Advanced Tab’ and select ‘Onboard Device Configuration’.
• Set ‘SATA Mode’ to ‘AHCI’.
• Navigate to ‘Boot’ tab and set ‘Secure Boot’ to ‘Enable’ and ‘Load Legacy OPROM’ to ‘Disable’.
• Boot Mode should be set to ‘UEFI’.
• Save the settings and Exit from the BIOS.

Once the system restarts, Go to the ‘One Time Boot Menu’ by pressing F12 at the Dell logo 6-7 times.

Select the boot device under UEFI to boot.

In case you have other problems in installing Windows update, check out those methods.