It would mean that the current installation of XP on the system has been corruped for whatever reason, perhaps some core files were deleted that help to run the system. You'll have to re-install XP on that machine. As instructed by Knotaclu. Go into the boot menu and select the first boot device to be your USB stick and not the laptops internal hard drive. Do it this way, and not through quick boot as i've experienced that the keyboard will not respond to your key strokes if the device used to install XP is accessed through quickboot rather than going into the bios and selecting your first boot device to be the on that will be installing XP on to that system. To get into the bios it will vary from one machinet to another, usually its 'DEL' or 'F2' It should say when booting up which key does what. If any problems to arise then please do come back and let us know. Good luck.👍