[Matplotlib-users] problem with import pylab

[H L <hu...@ya...>]

Hello:
 
I am having problem with "import pylab". I attached the traceback below. I have googled on the web but haven't found a solution. Can someone here help?
 
I have ActivePython 2.5, numpy-1.4.0-win32, and matplotlib-0.99.1.win32-py2.5.exe, and Windows XP SP3.
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Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
  File "C:\Python25\lib\site-packages\pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "C:\Python25\lib\site-packages\matplotlib\pylab.py", line 247, in <module>
    from matplotlib.pyplot import *
  File "C:\Python25\lib\site-packages\matplotlib\pyplot.py", line 78, in <module>
    new_figure_manager, draw_if_interactive, show = pylab_setup()
  File "C:\Python25\lib\site-packages\matplotlib\backends\__init__.py", line 25, in pylab_setup
    globals(),locals(),[backend_name])
  File "C:\Python25\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 8, in <module>
    import tkagg                 # Paint image to Tk photo blitter extension
  File "C:\Python25\lib\site-packages\matplotlib\backends\tkagg.py", line 1, in <module>
    import _tkagg
ImportError: DLL load failed: The specified module could not be found.
 
Thanks. 
 
HL