I\'m facing same problem described here: why-rails-fails-with-ruby-exe-has-encountered-a-problem-and-needs-to-close. that is ruby get crashed with following error:
Running 1.9.2 on windows puts you in a REALLY small minority of users. If you don't have an explicit need for 1.9, I'd use 1.8.7. Specifically, I'd use the package from RailsInstaller: http://railsinstaller.org/