ssh-keygen command not found when setting up Git on Windows
Solution 1:
it would appear that you don't have ssh installed on your computer. you will need an ssh client, since it appears you on using windows you can use http://cygwin.com/ and it will come with one, I don't know about a portable version of ssh, though..
Solution 2:
The tutorial on GitHub is wrong. The correct one is ssh-keygen -t rsa -C
I also had this problem.