title: matplotlib "DLL load failed" when import pylab
body: <p>I'm new to matplotlib. My environment is WinXP, PythonWin 2.6.2, NumPy 1.3.0, matplotlib 0.98.5.3.</p>
  
  <pre><code>&gt;&gt;&gt; import matplotlib.pylab as pylab
  Traceback (most recent call last):
    File "&lt;interactive input&gt;", line 1, in &lt;module&gt;
    File "D:\Python26\lib\site-packages\matplotlib\pylab.py", line 253, in &lt;module&gt;
      from matplotlib.pyplot import *
    File "D:\Python26\lib\site-packages\matplotlib\pyplot.py", line 75, in &lt;module&gt;
      new_figure_manager, draw_if_interactive, show = pylab_setup()
    File "D:\Python26\lib\site-packages\matplotlib\backends\__init__.py", line 25, in pylab_setup
      globals(),locals(),[backend_name])
    File "D:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 8, in &lt;module&gt;
      import tkagg                 # Paint image to Tk photo blitter extension
    File "D:\Python26\lib\site-packages\matplotlib\backends\tkagg.py", line 1, in &lt;module&gt;
      import _tkagg
  ImportError: DLL load failed: cannot find the module
  </code></pre>
  
  <p>I searched the web and it's said because lack of msvcp71.dll, but there is already one in my C:\windows\system32\</p>
  
  <p>anyone can help?
  Thanks.</p>