Redmine

Hi All,
I install redmine 0.9.3 at Window Server 2003. After shorttime user ( about < 5 minutes). Redmine have a problem slowly reponds user's action.
View log at server are :

[2010-04-13 09:21:31] ERROR Errno::ECONNABORTED: An established connection was a
borted by the software in your host machine.
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:324:in `write'
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:324:in `<<'
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:324:in `_write_data'
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:296:in `send_body_string'
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:187:in `send_body'
C:/Ruby/lib/ruby/1.8/webrick/httpresponse.rb:104:in `send_response'
C:/Ruby/lib/ruby/1.8/webrick/httpserver.rb:79:in `run'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
C:/Ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
C:/Ruby/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/webrick.rb:14
:in `run'
C:/Ruby/redmine/vendor/rails/railties/lib/commands/server.rb:111
C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_ori
ginal_require'
C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require
'
script/server:3

Please help me to resolve it. Thanks....