How can I install pyQt5

hi,i am new to 'pyqt'.
When I try installing the pyQt5 (on Windows) using the command python configure. I get following error:

Code:

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Error: error could not find qmake configuration file win32-msvc
    Error:error failed to determine the detail of your qt installation

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I got the pyQt5 here: http://www.riverbankcomputing.co.uk/...pyqt/download5
sip and python (from "http://www.riverbankcomputing.co.uk/software/")installation is done but while installing pyqt5 error occurs.

(I am using VS2012 developers command prompt for installing pyqt, and i have QT installed on my pc)
How can I install pyQt5?