[Matplotlib-users] ImportError: No module named six

[garyr <ga...@fi...>]

I downloaded version 1.4.3 and installed it (i.e., executed 
matplotlib-1.4.3.win32-py2.6.exe). Now when I
attempt to run a program I get the following:

>python rainfallYears.py
Traceback (most recent call last):
  File "rainfallYears.py", line 4, in <module>
    import matplotlib.pyplot as plt
  File "C:\Python26\lib\site-packages\matplotlib\__init__.py", line 105, in
<module>
    import six
ImportError: No module named six
>Exit code: 1

So then I went back to 1.3.1 and get the same error...
Help!