C:\work\visualnovel>ruby -v
ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]

C:\work\visualnovel>ruby visualnovel.rb
C:/Ruby/lib/ruby/1.8/i386-mswin32/tcltklib.so: 126: 指定されたモジュールが見つか
りません。   - C:/Ruby/lib/ruby/1.8/i386-mswin32/tcltklib.so (LoadError)
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`re
quire'
        from C:/Ruby/lib/ruby/1.8/tk.rb:7
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`ge
m_original_require'
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`re
quire'
        from ./guiutil.rb:4
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`ge
m_original_require'
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in 
`re
quire'
        from visualnovel.rb:1

C:\work\visualnovel>