You probably have a Macintosh which requires a more recent version of
system software than was included on your Guided Tour disk. A workaround
is, instead of booting from the Guided Tour floppy, to drag the Tour Folder
from the Guided Tour disk to the hard disk. While still running under the
System Folder on the hard disk, launch the tour by double-clicking on its
icon (looks like a movie projector).
This workaround should work with several older Guided Tour disks, such as
those for the Apple Scanner and the LaserWriter IISC.