Missing Legacy Boot Option in BIOS

[pdub2004]

Hi, I am trying to install Windows XP on my HP Pavilion (For running abandonware you cant use on current computers)  but when I go into the BIOS the legacy boot option is missing. Is there a way where im still able to get it to boot into legacy mode and install XP on my machine?

[A4Apollo]

Hi! @pdub2004,

Try few steps recommended below.

By default the newer PC's would be configured with UEFI, you don't have the option to change any settings.

Unified Extensible Firmware Interface (UEFI) is firmware code from a chip on your motherboard that provides extra functionality, beyond the Basic Input/Output System (BIOS). UEFI is a way to do things with your computer before an operating system is loaded. To name a few features, UEFI can provide extra graphic menus and system information on a computer, and basic diagnostics on both a computer and a tablet. How does it do this? UEFI works with the BIOS to initialize the computer or tablet's hardware before handing hardware control over to the operating system. UEFI can also load and display software programs from storage devices to provide even more functionality, such as more detailed system information and extended hardware diagnostics.

However, try the steps recommended below and check if it helps.

Shutdown the notebook.

Tap away at the esc key as soon as you press the power button to enter the Start-up Menu and then select the Bios Menu ( f10 ).

Under the System Configuration tab, expand the Boot Options Menu.

You need to set Secure Boot to Disabled and Legacy Devices to Enabled.

When done, press f10 and select to save the changes.

Refer this article to know more information about UEFI and the Startup Menu.

To check if your PC is running with UEFI or legacy try the steps recommended below.

Open Run, type MSInfo32 and hit Enter to open System Information.

If your PC uses BIOS, it will display Legacy. If it is using UEFI, it will display UEFI! If your PC supports UEFI, then if you go through your BIOS settings, you will see the Secure Boot option.

Or you can try the steps below.

To determine whether your PC is using BIOS or EFI/UEFI please follow the steps below:
Start your PC.
Go to Start > Computer.
Navigate to C:\Windows\Panther
In the folder named Panther you will see a text file titled setupact.log. The file will automatically open in Notepad.
Once you have opened setupact.log, click Ctrl+F to bring up the Find box and search for an entry named Detected Boot Environment.
Once you find Detected Boot Environment, you will notice the words BIOS or UEFI mentioned as follows:

Callback_BootEnvironmentDetect: Detected boot environment: BIOS

OR

Callback_BootEnvironmentDetect: Detected boot environment: UEFI

Hope this answers your query! 
Have a great day ahead! 🙂

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