我正在尝试在Windows 7上安装Scrapy。我正在按照以下说明进行操作：

http://doc.scrapy.org/en/0.24/intro/install.html#intro-
install

我已按照本教程https://adesquared.wordpress.com/2013/07/07/setting-up-python-and-
easy_install-on-
windows-7/下载并安装了适用于Windows的python-2.7.5.msi。，并且如上所述设置环境变量，但是当我尝试在命令提示符下运行python时，出现此错误：

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\>python
‘python’ is not recognized as an internal or external command,
operable program or batch file.

C:\> python ez_setup.py install
‘python’ is not recognized as an internal or external command,
operable program or batch file.

C:\>

你能帮我解决这个问题吗？