If you find an ISO labeled en_windows_xp_professional_x64.iso :
Support for Windows XP Professional x64 Edition ended on April 8, 2014, coinciding with the end of support for the mainstream 32-bit versions. iso windows xp 64 bits
┌────────────────────────────────────────────────────────┐ │ WINDOWS XP KERNELS │ ├───────────────────────────┬────────────────────────────┤ │ 32-bit (x86) OS │ 64-bit (x64) OS │ │ Built on NT 5.1 Kernel │ Built on NT 5.2 Kernel │ │ (Consumer/Desktop Branch) │ (Server 2003 Base Code) │ └───────────────────────────┴────────────────────────────┘ The Core Kernel Difference If you find an ISO labeled en_windows_xp_professional_x64