Do you have the needed for your specific hardware, or
This happens because Rufus writes a standard DOS boot sector, but XP needs a specialized one. Here is the manual hotfix: windows xp rufus usb
You need a full ISO image of Windows XP. Rufus works best with untouched Volume License (VL) or Retail ISOs. Modified "N-Lite" versions sometimes work, but for stability, use a standard XP SP3 (Service Pack 3) ISO. Do you have the needed for your specific