Erro Sistema De Cadastro de usuarios

Alguem sabe o porque desse erro? e como resolve-lo?? cadastrouser.php ----- http://pastebin.com/T1V7TyV9 formulario.php ----- http://pastebin.com/NyDbjbjG conexão.php --- http://pastebin.com/ciM3hBSr erro logo abaixo Warning: include(lib/conexao.php): failed to open stream: No such file or directory in C:Program Files (x86)EasyPHP-DevServer-14.1VC11datalocalwebprojectsProjeto Weblibcadastrouser.phpon line 3 Warning: include(): Failed opening 'lib/conexao.php' for inclusion (include_path='.. C:phppear') in C:Program Files (x86)EasyPHP-DevServer-14.1VC11datalocalwebprojectsProjeto Weblibcadastrouser.php on line 3 Deprecated: mysql_query(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in C:Program Files (x86)EasyPHP-DevServer-14.1VC11datalocalwebprojectsProjeto Weblibcadastrouser.php on line 7