Note: Download the portable version
To make this truely portable take a gander at:
$ git config --global user.name "John Doe"
$ git config --global user.email [email protected]
$ git config --global core.autocrlf input
In this case I simply added 'C:\bin\Git\cmd' to the user environment variable PATH. I tend to make my life easier by using a path editor such as http://patheditor2.codeplex.com/
Note: Place this in a folder called 'composer' within the bin directory
Use the composer_install.bat file below to install composer
All of these are installed using composer