You can download the standalone update for existing XP installations (KB936929) from the Microsoft Update Catalog .

: Correctly maps the USB drive as a hard disk emulation so the Windows XP installer does not crash. Step-by-Step Guide: Creating the Bootable USB

If you want to move forward with setting up your classic machine, let me know:

This tutorial uses due to its high success rate with Windows XP.

Cause: The installer cannot communicate with your hard drive controller.

Because Windows XP was designed well before USB booting became standard, standard modern flashing utilities often fail to configure the master boot record (MBR) correctly for XP. The following tools are highly recommended:

Keep this USB offline. Never connect Windows XP to the internet. Use it only for retro gaming, embedded machine control, or virtualization learning.