Has anyone managed to update VirtualRails to Rails 3?

I've managed to get as far as installing RVM, creating a new project
folder but when I try to run the rails server I get this message:

virtualrails@jay ~/Sites/test_project $ rails server
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs/runtimes.rb:47:in
`autodetect': Could not find a JavaScript runtime. See
https://github.com/sstephenson/execjs for a list of available runtimes.
(ExecJS::RuntimeUnavailable)
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs.rb:5:in
`<module:ExecJS>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs.rb:4:in
`<top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in
`<top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in
`<top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.1/lib/coffee-rails.rb:1:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.1/lib/coffee-rails.rb:1:in
`<top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in
`block (2 levels) in require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in
`each'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in
`block in require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in
`each'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler.rb:122:in
`require'
  from /home/virtualrails/Sites/test_project/config/application.rb:7:in
`<top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:52:in
`require'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:52:in
`block in <top (required)>'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:49:in
`tap'
  from
/home/virtualrails/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:49:in
`<top (required)>'
  from script/rails:6:in `require'
  from script/rails:6:in `<main>'

Running VirtualBox 3.2.12 on Windows 7 64bit.

Thanks in advance.
Jason.

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