Joomla 2.5.4安装后不能显示前台

环境描述如下：
PHP Built On
Windows NT ****-PC 6.1 build 7601 (Windows 7 Ultimate Edition Service Pack 1) i586
Database Version
5.5.25
Database Collation
utf8_general_ci
PHP Version
5.4.2
Web Server
Microsoft-IIS/7.5
WebServer to PHP Interface
cgi-fcgi
Joomla! Version
Joomla! 2.5.4 Stable [ Ember ] 2-April-2012 14:00 GMT
Joomla! Platform Version
Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT
User Agent
Mozilla/5.0 (compatible; MSIE 9.0; W