How to Install Windows 11 on a Dell Optiplex 990 (and perhaps other older hardware)

To perform a clean install

  1. Configure the BIOS
    • Set boot mode to UEFI
    • Set SATA configuration to AHCI
    • Enable Secure Boot/TPM
  2. Prepare a USB drive
    • Use Ventoy to create a USB drive
    • Copy the win11 ISO to the data partition of the drive
  3. Wipe the drive during the install process
    • Boot from the USB
    • When you see the “Where do you want to install Windows?” screen press Shift + F10 to open a command prompt
    • Then type the following commands,
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