阿q形象出现的现实原因:phpMyAdmin出错

出错信息如下，这个网站经常出这个错误，谁帮我看看是怎么回事好吗？
Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 23

Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 24

Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 25

Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 26

Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 27

Warning: Cannot modify header information - headers already sent by (output started at D:\wwwroot\php_admin\libraries\auth\config.auth.lib.php:92) in D:\wwwroot\php_admin\header.inc.php on line 29

错误

MySQL 返回：

Access denied for user: 'root@qxj-cvfvbcqpa77' (Using password: NO)

这到底是哪里出问题了？系统问题还是怎么回事？网页显示又是完全正常的。但phpMyAdmin报错，无法改数据库里的东西。哪位朋友帮我看一下。
我用的是IIS6.0+windows server2003+php+mysql+phpadmin 进入phpadmin的页面就开始提示错误，但之前运行很正常，平时就是往网页中加一点文章，没有别的改动．每次都是运行一段时间之后就开始提示这个错误，到底是怎么回事？