python is not recognized as an internal or external command

I try to install this software . for that python is required to install in your system. For that when I install python from here of name python-2.7.3.msi.

I am working on Windows 7.

Hierarchy of my python software is same as in this post

After doing that, I make PATHVALUE = C:\Python27\Scripts

When I run any python file. It shows

python is not recognized as an internal or external command, 
operable program or batch file.
Failed to create vc project files.

What to do please help.

You want to append to your PATH the string C:\Python27, not the scripts folder. Basically, you want the folder with the actual binary python.exe on your path.

Try this screencast or (not a best way) put python executable into C:\Windows\system32 folder.

The better way is to change Windows environment variable. In short, your path is: My Computer ‣ Properties ‣ Advanced ‣ Environment Variables

For more details please see this.