Qmake command not recognized

[Rakula]

I am new to Qt. I installed Qt 4.6.2 beta from the Internet smoothly with no technical input on my part. An attempt to install the final version failed so I continued to use the beta version to finish projects I had started. I have completed a project and I am trying to run qmake for the first time. Following the statement from the qmake manual:-

'You can now use qmake to generate a Makefile for your application. On the command line, in your project's directory, type the following:

qmake -o Makefile hello.pro'

I get an error message :- " 'qmake' is not recognized as an internal or external command, operable program, or batch file.' ". Screen-shots are attached, I am using Windows Vista Business. Any suggestions?