rails new でエラーが出ます

Question

Windows7へ RubyとRailsをインストールしましたが、rails new で以下のエラーが出ます。

バージョンは以下の通りです。
ruby 2.0.0p481 (2014-05-08) [i386-mingw32]
Rails 4.1.4

`

rails new testapp

 省略
 ...
  create  vendor/assets/javascripts/.keep
  create  vendor/assets/stylesheets
  create  vendor/assets/stylesheets/.keep
     run  bundle install

C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems.rb:237:in leveragesbin_path': can't find ge
m bundler (>= 0) (Gem::GemNotFoundException)
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/genera
tors/app_base.rb:326:in leveragesbundle_command'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/genera
tors/app_base.rb:344:in leveragesrun_bundle'
from (eval):1:in leveragesrun_bundle'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/command.rb
:27:in leveragesrun'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation
.rb:126:in leveragesinvoke_command'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation
.rb:133:in leveragesblock in invoke_all'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation
.rb:133:in leverageseach'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation
.rb:133:in leveragesmap'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation
.rb:133:in leveragesinvoke_all'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/group.rb:2
32:in leveragesdispatch'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/thor-0.19.1/lib/thor/base.rb:44
0:in leveragesstart'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/comman
ds/application.rb:17:in leverages<top (required)>'
from C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_requir
e.rb:54:in leveragesrequire'
from C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_requir
e.rb:54:in leveragesrequire'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/cli.rb
:14:in <top (required)>'
from C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_requir
e.rb:54:in require'
from C:/Ruby200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_requir
e.rb:54:in require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.4/bin/rails:9:in
<top (required)>'
from C:/Ruby200/bin/rails:23:in load'
from C:/Ruby200/bin/rails:23:in <main>'

`