ImportError: matplotlib requires dateutil

I have successfully installed matplotlib with python 2.6 on x64 Windows7. When I try to import matplotlib, it shows the following error. I have also installed numpy following this link: Installing Numpy on 64bit Windows 7 with Python 2.7.3

    import matplotlib.pyplot as plt

    Traceback (most recent call last):
      File "<pyshell#2>", line 1, in <module>
        import matplotlib.pyplot as plt
      File "C:\Python26\Lib\site-packages\matplotlib\", line 110, in <module>
        raise ImportError("matplotlib requires dateutil")
    ImportError: matplotlib requires dateutil

How can I make it work?

I installed from

Here's a list of the programs you can install on windows:

And you'll need the following dependencies: Requires numpy, dateutil, pytz, pyparsing, six


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