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Re:Getting Started with Ruby on Rails on Windows by MrBra on Saturday December 07, 2013 @09:28PM (#6868728)
What about simply downloading ruby-installer and devkit[1] installing those and then running:

gem update --system

gem install rails

rails new mynewapp

For someone experimenting with rails it's more than enough!

[1] http://rubyinstaller.org/downloads/