Rails 4 install

[Oliver David]

I'm newbie and installed Rails last week.  When I did rails -v in cmd prompt, I got this:

C:\Users\oliver\lesson3>ruby -v

ruby 2.0.0p0 (2013-02-24) [i386-mingw32]

C:\Users\oliver\lesson3>rails -v

'rails' is not recognized as an internal or external command,

operable program or batch file.

I want to upgrade or install Rails 4.  Does this mean I don't have Rails installed?  I used RailInstaller 3.0 last week to install Ruby on Rails.

[Tim Millwood]

It doesn't look like rails is installed.

No idea how to do it on Windows but on Linux or Mac I would suggest running, gem install rails

[Oliver David]

ok thanks.