You dont have the SATA drivers for XP. New machines use SATA Hard Drives. XP didnt come with SATA drivers by default so you have to use the F6 to install 3rd party drivers during setup.
I would seriously consider this a warning. As you might find that this is not the only driver missing. Many manufacturer's have stopped supplying XP drivers. Last thing you want to do is finally get XP installed, just to find out you have no sound, mouse, or other device support.