[NTG-context] ConTeXt in MiKTeX

Hello. I need ConTeXt Mark IV environment on a USB stick because I don´t have administrative rights over the computer. The operating system is windows. I downloaded MiKTex 2.9 portable (Texworks) and ConTeXt package but I can not get it run. I've searched on the web how configurate Texworks but I did not find a manual. Could you help me? Thanks.