Python django-admin.py错误：来自django.core导入管理ImportError:没有名为django.core的模块

当我尝试在windows8下运行django-admin.py时，出现以下错误。我还安装了python27和VirtualNVRapper win

(juice) C:\>pip freeze
Django==1.6.5

(juice) C:\>django-admin.py
Traceback (most recent call last):
  File "C:\Users\Mohamed\Envs\juice\Scripts\django-admin.py", line 2, in <module
>
    from django.core import management
ImportError: No module named django.core

(juice) C:\>

我还检查了path sys变量，它列出了c:\python27

任何建议都会有帮助

======================================================== 根据下面的建议，我添加了PYTHONPATH系统变量，并尝试了django-admin.py，但我遇到了相同的错误！

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所以在这一点上，我想我应该在virtualenv之外安装django。但是，如果我这样做了，我非常肯定Django-admin.py会起作用，但是如果使用virtualenv管理python包的整个目的失败了……

您是否安装了python 2和3？可能是

(juice) C:\>python
Python 2.7.8 (default, Jun 30 2014, 16:03:49) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> for path in sys.path:
...    print path
...

C:\Users\Mohamed\Envs\juice\lib\site-packages\setuptools-0.6c11-py2.7.egg
C:\Users\Mohamed\Envs\juice\lib\site-packages\pip-1.3.1-py2.7.egg
C:\Python27
C:\Python27\DLLs
C:\Python27\Lib
C:\
C:\Windows\system32\python27.zip
C:\Users\Mohamed\Envs\juice\DLLs
C:\Users\Mohamed\Envs\juice\lib
C:\Users\Mohamed\Envs\juice\lib\plat-win
C:\Users\Mohamed\Envs\juice\lib\lib-tk
C:\Users\Mohamed\Envs\juice\Scripts
C:\Users\Mohamed\Envs\juice
C:\Users\Mohamed\Envs\juice\lib\site-packages
>>>