If you haven't done so by now, 
the file NRAREST1.zip should be unzipped
(preferably to a floppy to install from 
 the A:\ drive)
and the files kept in a single directory 
for the installation process.


To use the setup program
click on the icon for 

Setup.exe (installation from any directory)

or 

using file manager or run
activate setup program from A:\drive as
A:\setup.exe
(or substitute A:\ for location of files)