安装2.5核心程序后 打不开配置页面

Warning: require_once(D:\wwwroot\heysto2\wwwroot\libraries/platform.php) [function.require-once]: failed to open stream: No such file or directory in D:\wwwroot\heysto2\wwwroot\libraries\import.php on line 39
Fatal error: require_once() [function.require]: Failed opening required 'D:\wwwroot\heysto2\wwwroot\libraries/platform.php' (include_path='.;C:\php5\pear') in D:\wwwroot\heysto2\wwwroot\libraries\import.php on line 39
输入域名后 网站显示这个内容 我是直接下载joomla之门的最新2.5核心安装包的