Modern computers use UEFI, but Windows XP requires legacy BIOS mode.
Windows XP SP3 built upon the foundation laid by its predecessors, SP1 and SP2, incorporating various updates, security patches, and minor improvements. Some of the key features and enhancements included: download windows xp sp3 iso 32-bit original
If you see these, avoid the site immediately: Modern computers use UEFI, but Windows XP requires
You cannot simply copy the ISO to a USB drive. You need a tool to make it bootable. Modern computers use UEFI