title: Why is pydot unable to find GraphViz's executables in Windows 8?
body: <p>I have GraphViz 2.32 installed in Windows 8 and have added C:\Program Files (x86)\Graphviz2.32\bin to the System PATH variable. Still pydot is unable to find its executables.</p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;pyshell#26&gt;", line 1, in &lt;module&gt;
      graph.write_png('example1_graph.png')
    File "build\bdist.win32\egg\pydot.py", line 1809, in &lt;lambda&gt;
      lambda path, f=frmt, prog=self.prog : self.write(path, format=f, prog=prog))
    File "build\bdist.win32\egg\pydot.py", line 1911, in write
      dot_fd.write(self.create(prog, format))
    File "build\bdist.win32\egg\pydot.py", line 1953, in create
      'GraphViz\'s executables not found' )
  InvocationException: GraphViz's executables not found
  </code></pre>
  
  <p>I found this <a href="https://code.google.com/p/pydot/issues/detail?id=65" rel="noreferrer">https://code.google.com/p/pydot/issues/detail?id=65</a> but am unable to get the problem solved.</p>