python 3.6-导入tensorflow时tensorflow dll加载失败

我使用python 3.6上的pip3在命令提示符上安装了tensorflow,使用:

pip3 install tensorflow==1.5

在检查是否可以使用python从终端导入tensorflow时,我收到以下错误消息:

Python 3.6.0rc2 (v3.6.0rc2:800a67f7806d, Dec 16 2016, 23:22:07) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tensorflow as tf

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\{User}\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\__init__.py", line 24, in <module>
    from tensorflow.python import *
  File "C:\Users\{User}\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\__init__.py", line 52, in <module>
    from tensorflow.core.framework.graph_pb2 import *
  File "C:\Users\{User}\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\core\framework\graph_pb2.py", line 6, in <module>
    from google.protobuf import descriptor as _descriptor
  File "C:\Users\{User}\AppData\Local\Programs\Python\Python36\lib\site-packages\google\protobuf\descriptor.py", line 47, in <module>
    from google.protobuf.pyext import _message
ImportError: DLL load failed: The specified procedure could not be found.

DLL中到底缺少什么?