Matplotlib unable to plot on my windows 8.1 machine.

I have installed the latest version of matplotlib but it's unable to plot.
Below is the error message, please help:

Traceback (most recent call last):
  File "C:/Users/Physics
department/Desktop/Python_programs/", line 2, in <module>
    import matplotlib.pyplot as plt
  File "C:\Python36\lib\site-packages\matplotlib\", line 200, in
  File "C:\Python36\lib\site-packages\matplotlib\", line 194, in
    module = importlib.import_module(modname)
  File "C:\Python36\lib\importlib\", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: DLL load failed: The specified module could not be found.


Sent from: