After the introduction of Windows 8 in september 2012, then new computers with Windows 8 or 10 are characterized
by having a GPT partitioned harddisk booting in UEFI secure mode through efi folder on hidden FAT32 boot drive.
XP is not compatible with GPT partitioning and is not compatible with UEFI boot mode.
XP can be used on such computers by booting in BIOS mode with grub4dos from FAT32 USB-stick
and using XP installed in VHD located on NTFS partition of second internal MBR patitioned harddisk.
Install of XP in VHD is described here http://reboot.pro/topic/18547-vhd-xp-setup-install-xp-in-vhd/
============================================================================================
Install of Windows from USB by using WinNTSetup in WinPE environment is described here http://www.msfn.org/board/topic/149612-winntsetup-v386/
UFD_FORMAT.exe and UEFI_MULTI.exe can be used to make USB-Stick bootable with 10PE and 8.1SE wim files. http://reboot.pro/topic/18182-uefi-multi-make-multi-boot-usb-drive/#entry168079
More Info on how to make Win10PE and Win8.1SE wim files is found here
============================================================================================
Install of XP on NTFS partition of internal MBR harddisk and booting from FAT32 USB-stick
1. Use UFD_FORMAT and UEFI_MULTI.exe to create FAT32 USB-stick bootable with WinPE from Bootmanager Menu
2. After booting with WinPE from USB then use WinNTSetup to Install XP on NTFS partition of internal MBR harddisk
In WinNTSetup use R-mouse to select XP ISO file and select as Boot Drive and as Installation Drive the same NTFS partition of MBR harddisk
3. After booting (3x) in BIOS-mode from USB-stick, first in Bootmanager Menu select Grub4dos,
and then in Grub4dos Menu select find and load NTLDR of Windows NT/2K/XP
http://reboot.pro/topic/18182-uefi-multi-make-multi-boot-usb-drive/#entry168079
In UEFI_MULTI don't Add XP to Bootmgr Menu, since this will add the real ntldr to your FAT32 USB boot drive,
whereas you want to find ntldr (= renamed setupldr.bin) for install of XP located on NTFS partition of internal MBR harddisk.
==