Why won't Rails install (Windows 7)?

Question

Ruby on Rails

I try to install Rails on Windows, but the result is always the same. It is worth typing "rails --version" to check - the console issues "the system cannot find the specified path"
DevKit is. Through RailsInstaller, the same
gem install rails
either gives an error ERROR: Failed to build gem native extension windows rails
or shows that the gem is installed, but still does not work

Answer 1

Under the visible one, there is a normal option to work only on 10k through Bash on Ubuntu on Windows
Setting example

Answer 2

Look into the PATH environment variable. Have you completed the post-installation process?
In general, Ruby under Windows is that hemorrhoids. Get a linux virtual machine...