A new prompt appeared. Not part of any Windows installer he had ever seen. A command line, blinking in amber monospace:

The Windows XP ISO is a bootable image. It contains the necessary boot sector code and file structure (usually a "disc image" of the Microsoft Corporation style) required to initialize the hardware and launch the text-mode setup manager. The creation of bootable media from these ISOs—via tools like Nero Burning ROM, ImgBurn, or Rufus—remains a fundamental skill in IT forensics and legacy system administration.

But this one? This one wanted his reality.

A pause. Then Dr. Thorne's voice, barely audible: "You don't install it, Leo. It installs you —into every branch where you made a different choice. Every XP machine ever connected to the internet, from 2001 to 2014, becomes a node. And you become the administrator of reality's crash dump."

If you are installing an XP ISO today, keep these community-tested tips in mind: The BEST Version of Windows XP? - Windows XP Delta Edition

Minimum 233 MHz Pentium (300 MHz or higher recommended).