The below video is a very simple illustration on how to install Snort version 2.9.2.2 on Windows 7. There are several steps that must be performed to convert Snort (which is designed to run on a Unix system) to Windows format, and this video illustrates them.
I wouldn't use the setup that is performed here long term, but it's a good recommendation for people who want to see the functionality of Snort to see if it'll work in their environment.