install mapnik on windows7 64 bit

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Python

I have troubles to install mapnik plugin on windows7 64bit for python. I tried to install it, but when I import it, I get an error.
would you please guiding me how I can install it?

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    import mapnik
  File "C:\mapnik-v2.2.0\python\2.7\site-packages\mapnik\__init__.py", line 69, in <module>
    from _mapnik import *
ImportError: DLL load failed: %1 is not a valid Win32 application.