After
the file NRGX11a.zip or 
the file NRGX11a.exe is unzipped
(preferably to a floppy to install from 
 the A:\ drive
and the files kept in a single directory 
for the installation process)
use the setup program.

Click on the icon for 
NRGSETUP.lnk (only if installation from A:\)
or
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)