Thanks Vijay and Nicolas, indeed, I uninstalled Railsinstaller which used Ruby 1.9 and Rails 3.2
(Then took a lengthy detour, following this page:
http://railsapps.github.io/installing-rails.html, trying Railsbridge Virtual Machine, installing VirtualBox 4.2, then Vagrant_1.2.7.msi - only it couldn't locate the railsbridgeboston URL and since as suggested by
https://gorails.com/guides/using-vagrant-for-rails-development:
vagrant plugin install vagrant-vbguest
vagrant plugin install vagrant-librarian-chef
produced some error followed by the touch command not being recognized, I gave up and uninstalled Vagrant and VirtualBox.)
Instead, following
https://www.ruby-lang.org/en/installation/#rubyinstaller, now there'd be only Bitnami Ruby Stack left for the MS Windows user:
https://bitnami.com/stack/ruby/installerFine, I installed that, using port 81 for listening and 444 for access (instead of 80 and 443, respectively). It took some time, then passwords were removed from C:/Bitnam/rubystack-2.0.0-20/report.txt and stored elsewhere.
now running Rails 4.1.6, this finally worked:
opened Use Bitnami Ruby Stack for terminal prompt:
cd projects
rails new blog
cd blog/bin
rails server
and the welcome page displayed at
http://localhost:3000/Ctrl-C (then answer yes)
cd projects/blog/bin
rails generate controller welcome index
opened index.html.erb in blog/app/views/welcome to replace text with <h1>Hello, Rails from Blog!</h1>
opened routes.rb in in blog/config to uncomment the root line
rails server
displays Hello Rails from Blog! at
http://localhost:3000/