Install Cygwin (http://www.cygwin.com/)
- Select the folowing packages: curl, git, nano, openssh, openssl, ruby, unzip, util-linux, vim, wget
Download the RubyGems tarball from Ruby Forge (http://rubyforge.org/projects/rubygems/)
- wget http://rubyforge.org/frs/download.php/76072/rubygems-1.8.24.zip
- unzip rubygems-1.8.24.zip
In a bash terminal, navigate to the unpacked directory and run: