Importing tensorflow not working when upgraded
you can uninstall the tensorflow and re-install it.
Tensorflow was working fine when I had 1.4 but when I upgraded it, it stopped working.
The version that I installed is 1.11 with CUDA 9 and cuDNN 7. 

Traceback (most recent call last):   File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py",
  line 58, in 
      from tensorflow.python.pywrap_tensorflow_internal import *   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py",
  line 28, in 
      _pywrap_tensorflow_internal = swig_import_helper()   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py",
  line 24, in swig_import_helper
      _mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)   File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\imp.py",
  line 243, in load_module
      return load_dynamic(name, filename, file)   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\imp.py",
  line 343, in load_dynamic
      return _load(spec) ImportError: DLL load failed: The specified module could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):   File "", line 1, in
     File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow__init__.py",
  line 22, in 
      from tensorflow.python import pywrap_tensorflow  # pylint: disable=unused-import   File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python__init__.py",
  line 49, in 
      from tensorflow.python import pywrap_tensorflow   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py",
  line 74, in 
      raise ImportError(msg) ImportError: Traceback (most recent call last):   File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py",
  line 58, in 
      from tensorflow.python.pywrap_tensorflow_internal import *   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py",
  line 28, in 
      _pywrap_tensorflow_internal = swig_import_helper()   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py",
  line 24, in swig_import_helper
      _mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)   File
  "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\imp.py",
  line 243, in load_module
      return load_dynamic(name, filename, file)   File "C:\Users\anime\AppData\Local\Programs\Python\Python36\lib\imp.py",
  line 343, in load_dynamic
      return _load(spec) ImportError: DLL load failed: The specified module could not be found.