I use DBI :version => 0.4.1 with activerecord-sqlserver-adapter-1.0.0.9250 on both ruby's version. The same rails application that works on mswin32, doesn't work on mingw32, i obtain this message: Unable to load driver 'ADO' (underlying error: uninitialized constant DBI::DBD::ADO) i can't find where this constant must be initialized. if i remove the ADO.rb from mswin32 version path: C:\ruby\ruby-186p287\lib\ruby\site_ruby\1.8\DBD\ADO\ADO.rb i get this different message: Could not load driver (no such file to load -- C:/ruby/ruby-186p287/lib/ruby/site_ruby/1.8/dbd/ADO) Does anyone had similar trouble? -- Posted via http://www.ruby-forum.com/.