“dot.exe” not found in path. Pydot on Python (Windows 7)

I followed the instructions given in this blog.

Then I installed graphviz from here and added C:\Program Files (x86)\Graphviz2.38\bin to PATH.

Next I did:

conda install pydot-ng 

And finally in my notebook I added the two lines below.

import os
os.environ["PATH"] += os.pathsep + 'C:/Program Files (x86)/Graphviz2.38/bin/'