It's is likely that you already have it on your computer
if you have the full version of Access. Check in your
directory:
Program Files/Microsoft Office/Office10/Samples
or the appropriate directory on your PC. It should also
be on the Office CD so if it hasn't been installed with
the original installation, you can select to add samples
to your Office installation.
It is included in the Installation CD, and installs by default. So, if not
installed on your machine, it was omitted in a custom install or has been
deleted.
Can you not retrieve the Installation CD and install it?