菜鸟建站，各位高手帮忙！！

我新建立的网站打开后显示：
Warning: include(./class/class.main.php) [function.include]: failed to open stream: No such file or directory in E:\www\15193\index.php on line 3

Warning: include() [function.include]: Failed opening './class/class.main.php' for inclusion (include_path='.;C:\php5\pear') in E:\www\15193\index.php on line 3

Fatal error: Class 'main' not found in E:\www\15193\index.php on line 5
各位高手看一下怎么办啊？