Newbie can't figure out how to install restful_authentication plugin

I get this message when I try to install restful_authentication plugin
and I am stuck. I am running Windows Vista (don't ask...).

ruby script\plugin install -r 3072

git://github.com/technoweenie/restful-authentication.git
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_re
quire': no such file to load -- ./script/../config/../vendor/rails/
railties/lib/
initializer (LoadError)
        from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `re
quire'
        from ./script/../config/boot.rb:46:in `load_initializer'
        from ./script/../config/boot.rb:39:in `run'
        from ./script/../config/boot.rb:11:in `boot!'
        from ./script/../config/boot.rb:109
        from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `ge
m_original_require'
        from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `re
quire'
        from script/plugin:2

Ignore the -r 3072, that was from the svn location i tried. Output is
the same.