What you need to install is git
. It is the version control system (VCS) used by GitHub.
The native GitHub application does not provide the command line tools used by Go.
Git can be found and downloaded at http://git-scm.com/downloads
Once installed, make sure you have the path to the Git cmd folder in your %PATH% environment variable.
You can check this by running the command: echo %PATH%
On a Windows installation, you might find it located here:
C:\Program Files (x86)\Git\cmd