NSP is a suite of Perl scripts. There is no Graphic User Interface (GUI). You will need to run the program in a DOS session (in Windows). And you will need to install Perl before you can run the Perl programmes. Once you have downloaded and installed Perl (free from Active Perl http://www.activestate.com/activeperl/), you will be able to run perl scripts. Read the readme file of NSP for how to run the programme.