我用PHP做的页面，出现这样的错误，是什么意思呢？

Warning: Unknown(c:\inetpub\wwwroot\admin\web_system.php): failed to open stream: Permission denied in Unknown on line 0
Warning: (null)(): Failed opening ';c:\inetpub\wwwroot\admin\web_system.php'; for inclusion (include_path=';.;c:\php4\pear';) in Unknown on line 0