title: Python DLL load failed, whilst having installed packages
body: <p>I'm trying to run a python script however I get the message </p>
  
  <pre><code>ImportError: DLL load failed: %1 is geen geldige Win32-toepassing.
  </code></pre>
  
  <p>Full  error:</p>
  
  <pre><code>    Traceback (most recent call last):
    File "ROC_plotting.py", line 2, in &lt;module&gt;
      import matplotlib.pyplot as plt
    File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 115, in &lt;module&gt;
      _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
    File "C:\Python27\lib\site-packages\matplotlib\backends\__init__.py", line 32, in pylab_setup
      globals(),locals(),[backend_name],0)
    File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 6, in &lt;module&gt;
      from six.moves import tkinter as Tk
    File "C:\Python27\lib\site-packages\six.py", line 203, in load_module
      mod = mod._resolve()
    File "C:\Python27\lib\site-packages\six.py", line 115, in _resolve
      return _import_module(self.mod)
    File "C:\Python27\lib\site-packages\six.py", line 82, in _import_module
      __import__(name)
    File "C:\Python27\lib\lib-tk\Tkinter.py", line 38, in &lt;module&gt;
      import FixTk
    File "C:\Python27\lib\lib-tk\FixTk.py", line 68, in &lt;module&gt;
      import _tkinter
  ImportError: DLL load failed: %1 is geen geldige Win32-toepassing.
  </code></pre>
  
  <p>It seems some of these errors are concerning Matplotlib, however when I run</p>
  
  <pre><code>pip list
  </code></pre>
  
  <p>It seems that I do have installed matplotlib</p>
  
  <p>pip list output:</p>
  
  <pre><code>cycler (0.10.0)
  functools32 (3.2.3.post2)
  matplotlib (2.0.2)
  numpy (1.11.3+mkl)
  opencv-python (2.4.13.2)
  pip (9.0.1)
  pyparsing (2.2.0)
  python-dateutil (2.6.0)
  pytz (2017.2)
  scikit-learn (0.18.1)
  setuptools (28.8.0)
  six (1.10.0)
  wheel (0.29.0)
  </code></pre>
  
  <p>My python version is 2.7.13, I'm running on a 64-bit Windows system.</p>