The Guide shows you Howto Setup/Install Selenium Webdriver Python Windows 7.
To the Article Bottom you Find Link to Installing the Selenium ChromeDriver on Windows 7.
The Content give Focus Only to the Essentials Instructions and Commands to make it Easier to Follow.

Install Setuptools:
How to Install Python Setuptools on Windows 7Open Shell Window
Install Python Pip
easy_install pip
Install Python Selenium+Webdriver
pip install selenium
Test Selenium Installation
Open a New Command Prompt.
Try to Execute:
python
Load Selenium Webdriver.
>>>>from selenium import webdriver
Open Firefox Browser with Webdriver.
>>>>webdriver.Firefox()
Extra Indications
Link to Tutorial for Installing the Selenium Webdriver ChromeDriver:
Howto Install Selenium ChromeDriver on Windows7
Set Windows Path:
Howto Set the Path on Windows