After installing One-Click Rails and Postgres 8.1 on Windows, I tried to install the pure-ruby postgres adapter by running gem install postgres-pr It installed fine, and I can do this: G:\InstantRails\rails_apps>irb irb(main):001:0> require "rubygems" => true irb(main):002:0> require "postgres" => true But then if I specify in my config/database.yml to use adapter: postgres and rake migrate, rails says that it can''t find the postgres adapter. Digging a little deeper and making the database connection manually: irb(main):002:0> require "dbi" => true irb(main):003:0> DBI::VERSION => "0.0.23" irb(main):005:0> dbh = DBI.connect(''dbi:Pg:research_funding_development'', ''postgres'') TypeError: is not a class/module from G:/InstantRails/ruby/lib/ruby/site_ruby/1.8/dbi/dbi.rb:499:in `load_driver'' from G:/InstantRails/ruby/lib/ruby/site_ruby/1.8/dbi/dbi.rb:401:in `_get_full_driver'' from G:/InstantRails/ruby/lib/ruby/site_ruby/1.8/dbi/dbi.rb:381:in `connect'' from (irb):5 What gives? Am I doing something wrong here? -- Posted via http://www.ruby-forum.com/.