关于ruby 1.9 的gem提升缺少zlib.dll

Microsoft Windows [版本 6.0.6000]
版权所有 (C) 2006 Microsoft Corporation。保留所有权利。

e:\>ruby -v
ruby 1.9.0 (2007-12-25 revision 14709) [i386-mswin32]

e:\>gem -v
1.0.1

e:\>gem update --system
Updating RubyGems...
Bulk updating Gem source index for: http://gems.rubyforge.org
D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:386:in `require': 126: 找不到指定的模块。   - D:/Ruby/lib/ruby/1.9.0/i386-mswin32/zlib.so (LoadError)
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:386:in `unzip'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:333:in `block in fetch_index_from'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:329:in `each'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:329:in `fetch_index_from'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:352:in `fetch_bulk_index'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_index.rb:292:in `update'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache_entry.rb:33:in `refresh'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache.rb:135:in `block in refresh'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache.rb:128:in `each'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache.rb:128:in `refresh'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache.rb:40:in `cache'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/source_info_cache.rb:50:in `search'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/commands/update_command.rb:67:in `execute'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/command.rb:136:in `invoke'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/command_manager.rb:104:in `process_args'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/command_manager.rb:74:in `run'
        from D:/Ruby/lib/ruby/1.9.0/rubygems/gem_runner.rb:39:in `run'
        from D:/Ruby/bin/gem.bat:30:in `<main>'

e:\>gem

  RubyGems is a sophisticated package manager for Ruby.  This is a
  basic help message containing pointers to more information.

    Usage:
      gem -h/--help
      gem -v/--version
      gem command [arguments...] [options...]

    Examples:
      gem install rake
      gem list --local
      gem build package.gemspec
      gem help install

    Further help:
      gem help commands            list all 'gem' commands
      gem help examples            show some examples of usage
      gem help platforms           show information about platforms
      gem help <COMMAND>           show help on COMMAND
                                     (e.g. 'gem help install')
    Further information:
      http://rubygems.rubyforge.org

e:\>gem list

*** LOCAL GEMS ***



e:\>gem update --system
Updating RubyGems...
Bulk updating Gem source index for: http://gems.rubyforge.org
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    Error fetching remote gem cache: timed out fetching http://gems.rubyforge.org/yaml

e:\>