Å etablere rett firmware før windows installeres

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Use any of these methods to help make sure that Windows is installed using the correct firmware mode

If you install Windows by using Windows Setup or the Windows installation DVD, use preformatted hard drive on your destination PCs. Use the GPT file format for UEFI mode, or the MBR file format for BIOS mode. When Windows Setup runs, if the PC is booted to the wrong mode, Windows will fail to install. For more info, see Windows Setup: Installing using the MBR or GPT partition style.

You can remove the UEFI or BIOS boot files from either Windows PE or Windows Setup. For example, if you only include boot files for UEFI mode on the Windows installation DVD, and during manufacturing you accidentally attempt to boot the PC to BIOS mode, the PC will immediately fail to boot, and you can begin troubleshooting right away.
UEFI: To prevent Windows Setup or Windows PE from booting in BIOS mode, remove the bootmgr file on the root of the media.

BIOS: To prevent Windows Setup or Windows PE from booting in UEFI mode, remove the efi folder on the root of the media.

From Windows PE, you can check the GetFirmwareEnvironmentVariable function. For more info, see Boot Windows PE in UEFI or legacy BIOS mode.

See Also
Tasks
Windows PE USB: Install Windows PE to a USB drive

BIOS Mode - See if Windows Boot in UEFI or Legacy Mode

How to Check if Windows is Booted in UEFI or Legacy BIOS Mode


information Information
When the PC starts, the firmware interface controls the booting process of the PC, and then passes control to Windows or another operating system.

UEFI is a replacement for the older BIOS firmware interface and the Extensible Firmware Interface (EFI) 1.10 specifications.

For more information, see: UEFI Firmware


This tutorial will show you how to see if your Windows is booted in UEFI or legacy BIOS mode in Windows 7, Windows 8, and Windows 8.1.