In order to install STAFF completely follow the steps below.
First of all, you have to install Java Development Kit (JDK). Please refer Java Documentation for installation instructions.
Please set JAVA_HOME environment variable to refer installed JDK.
If JDK is installed to the "C:\Program Files\Java\jdk1.6.0" directory then JAVA_HOME="C:/Program Files/Java/jdk1.6.0".
To install STAFF, just unpack your distribution.
Please add STAFF bin directory to the Path environment variable to be able to run it in from any location.