IIS6.0WinSER03+PHP5.2+MySQL5.0.27 环境 PHP设置均按Mambo要求打开。

我怎么也看不明白，每次叫个朋友访问，都会反应错误页面信息，而让其刷新一下页面后，网站就正常显示了。

Why？后台显示正常，关闭或开启缓存机制依然出现首显错误页。
我第一次接触Mambo，希望有经验高人指点迷津。
访问页面： http://x.vistapc.cn/manbo 呵呵，中文拼音~~

引用:

Warning: require(includes/agent_browser.php) [function.require]: failed to open stream: No such file or directory in D:\my_web\MamboV4.6.1.cn\includes\mambofunc.php on line 175

Fatal error: require() [function.require]: Failed opening required 'includes/agent_browser.php' (include_path='G:\php;G:\php\dev;G:\php\ext') in D:\my_web\MamboV4.6.1.cn\includes\mambofunc.php on line 175

另，后台检查更新显示我需要升级到4.6.1
但我的系统本来就已经是4.6.1的中文版了。这个提示不用理它吧。

Mambo Version Information:
Your Mambo version is out of date. We recommend you upgrade.
The current stable version is 4.6.1
Your version is 4.6

Mambo Security Patch Information:
No patches have been released

Additional Messages:
Team Mambo has released 4.6.1 as a maintenance release to fix a number of bugs and security holes found in 4.6. It is recommended that 4.6 users update to 4.6.1.