I`m just install Ruby  1.8.5

C:\rubyclr\Samples\GoogleCalc>calc.rb
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_re
quire': no such file to load -- rubyclr (LoadError)
        from
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `re
quire'
        from C:/rubyclr/Samples/GoogleCalc/calc.rb:3