failed to open stream: No such file or directory

安装后提示
PHP Warning: require(/vendor/laravel/framework/src/Illuminate/Foundation/start.php): failed to open stream: No such file or directory in D:\WEB\Statistics\bootstrap\start.php on line 60
PHP Fatal error: require(): Failed opening required '/vendor/laravel/framework/src/Illuminate/Foundation/start.php' (include_path='D:\WEB\Statistics\vendor/phpseclib/phpseclib/phpseclib;.;C:\php\pear') in D:\WEB\Statistics\bootstrap\start.php on line 60

请各位高手指教.

服务器Windows 2003 / PHP 5.4.8