Ruby on Rails

hi all ,
  I am getting error when i try to run my app. from Radrails, also when installing "gem install ruby-gd" it shows some error,
  Can anyone provide the right installation steps and libraries name which required to install  gd libraries ?
  thanks in advanced ......



D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- GD (LoadError)
    from D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from D:/Documents and Settings/Administrator/My Documents/Aptana RadRails Workspace/suggestica/config/../lib/captcha_image.rb:22
    from D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from D:/Documents and Settings/Administrator/My Documents/Aptana RadRails Workspace/suggestica/config/environment.rb:24
    from D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from D:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/rails.rb:147:in `rails'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/mongrel_rails:113:in `cloaker_'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/configurator.rb:149:in `call'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/configurator.rb:149:in `listener'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/mongrel_rails:99:in `cloaker_'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/configurator.rb:50:in `call'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/configurator.rb:50:in `initialize'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/mongrel_rails:84:in `new'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/mongrel_rails:84:in `run'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/../lib/mongrel/command.rb:212:in `run'
    from D:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/bin/mongrel_rails:281
    from D:\Ruby187\bin\mongrel_rails:19:in `load'
    from D:\Ruby187\bin\mongrel_rails:19
    from -e:2:in `load'
    from -e:2

Thanks and Regards
Sachin S. Kewale
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