如何在localhost上安装laravel4？

我是Laravel的新手.我已经尝试在我的本地服务器上安装它,但是当在borwser中运行时,我收到此错误.

Warning: require(D:\xampp\htdocs\laravel\bootstrap/../vendor/autoload.php): failed to open    stream: No such file or directory in D:\xampp\htdocs\laravel\bootstrap\autoload.php on line 17

 Fatal error: require(): Failed opening required'D:\xampp\htdocs\laravel\bootstrap/../vendor/autoload.php'   (include_path='.;D:\xampp\php\PEAR') 
 in D:\xampp\htdocs\laravel\bootstrap\autoload.php on line 17

任何人都可以帮我如何在localhost上正确安装它？

在此先感谢您的帮助.