I don't understand why you're trying to act like you know what you're talking about with the 'I don't know whether it's a problem with my enviroment variables or what' crap, because you obviously DON'T know what you're talking about, and trying to come off like you do will only lead you into more confusion. In the future, when trying to ask for help, don't lie. Being straight forward will get you a lot farther.

To solve your problem, navigate to the directory from the command line (You know, Start>Run>command) and execute it. The reason it's not doing anything when you open it is because you're not telling it to do anything specific for you. All it sees is 'Oh, it's asking me for help. Here's the help page. I'm done now. *close*'. It'll do that from the command line too, unless you pass it some instructions, which i'm sure the help menu will instruct you on.
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