求助，PHP论坛网页出错，希望大侠们可以帮帮小弟！

我在Windows下搭建的php+mysql，我是根据本版置顶贴配置的
php版本是php-5.2.6  php网页可以顺利打开，但是在安装phpbb论坛时，论坛必须存放在三级目录以下才可以正常浏览，否则出现以下错误：

Warning: include(./extension.inc) [function.include]: failed to open stream: No such file or directory in D:\phpbb\index.php on line 25

Warning: include() [function.include]: Failed opening './extension.inc' for inclusion (include_path='.;C:\php5\pear') in D:\phpbb\index.php on line 25

Notice: Undefined variable: phpEx in D:\phpbb\index.php on line 26

Warning: include(./common.) [function.include]: failed to open stream: No such file or directory in D:\phpbb\index.php on line 26

Warning: include() [function.include]: Failed opening './common.' for inclusion (include_path='.;C:\php5\pear') in D:\phpbb\index.php on line 26

Notice: Undefined variable: phpEx in D:\phpbb\index.php on line 27

Warning: include(./includes/functions_selects.) [function.include]: failed to open stream: No such file or directory in D:\phpbb\index.php on line 27

Warning: include() [function.include]: Failed opening './includes/functions_selects.' for inclusion (include_path='.;C:\php5\pear') in D:\phpbb\index.php on line 27

Fatal error: Call to undefined function session_pagestart() in D:\phpbb\index.php on line 32

本人在网上搜索说是我的php.ini文件配置错误，希望大侠可以给个答案！ 或者请加我的QQ：47873669！！

你php配置有什么错误？是没有这些文件： ./extension.inc
提示不是说得很清楚了吗？

谢谢版主，问题已经解决了，是我文件夹的权限问题！