[Rails] Installing Ruby/TroubleShoot

I am having trouble with the Ruby on Rails for a windows 7 PC.

During the installation on Ruby it said missing file 'lib'

Then every time I try to generate a scaffold or controller it says
Could not find a JavaScript runtime. See
https://github.com/sstephenson/execjs for a list of available runtimes.
(ExecJS: :RuntimeUnavailable)

Attachments:
http://www.ruby-forum.com/attachment/6928/Ruby.odt

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