为什么装了DZ6.0EXP,打开出现源代码?

我装了DZ6.0EXP,又装了IIS,打开首页出现源代码,不知道哪里的问题.

1. <?php
   
2. 
   
3. /*
   
4.         [Discuz!] (C)2001-2007 Comsenz Inc.
   
5.         This is NOT a freeware, use is subject to license terms
   
6. 
   
7.         $Id: index.php 10486 2007-09-03 06:53:29Z liuqiang $
   
8. */
   
9. 
   
10. define('CURSCRIPT', 'index');
    
11. 
    
12. require_once './include/common.inc.php';
    
13. require_once DISCUZ_ROOT.'./include/forum.func.php';
    
14. 
    
15. $discuz_action = 1;
    
16. 
    
17. if($cacheindexlife && !$discuz_uid && $showoldetails != 'yes' && (!$_DCACHE['settings']['frameon'] || $_DCACHE['settings']['frameon'] && $_GET['frameon'] != 'yes') && empty($gid)) {
    
18. 
    
19.         $indexcache = getcacheinfo(0);
    
20. 
    
21.         if($timestamp - $indexcache['filemtime'] > $cacheindexlife) {
    
22.                 @unlink($indexcache['filename']);
    
23.                 define('CACHE_FILE', $indexcache['filename']);
    
24.                 $styleid = $_DCACHE['settings']['styleid'];
    
25.         } elseif($indexcache['filename']) {
    
26.                 @readfile($indexcache['filename']);
    
27.                 $debug && debuginfo();

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DZ6.0EXP,不是用IIS的?你要启动apache