Errores PHP, Ayuda???

[juan11cr]

Buenos dias, en mi pagina web me estan saliendo ocacionalmente estos errores, al oprimir F5 carga la pagina corrrectamente. alguien me puede ayudar para corregir esto?

Fatal error: require_once() [function.require]: Failed opening required 'D:\finagro.gov.co\www\utils\controls/../utils/hcemd5.php' (include_path='.;C:\php5\pear') in D:\finagro.gov.co\www\utils\controls\textbox.php on line 24

Fatal error: Cannot redeclare error() (previously declared in D:\finagro.gov.co\www\utils\functions.php:23) in D:\finagro.gov.co\www\utils\functions.php on line 34

Warning: require_once(D:\finagro.gov.co\www\html\plugins\ti cker\lib/survey_answer.php) [function.require-once]: failed to open stream: No such file or directory in D:\finagro.gov.co\www\html\plugins\ticker\lib\tick er.php on line 332

Fatal error: require_once() [function.require]: Failed opening required 'D:\finagro.gov.co\www\utils/content.php' (include_path='.;c:\php\includes;C:\php\pear') in D:\finagro.gov.co\www\utils\adodb.php on line 2215

Fatal error: require_once() [function.require]: Failed opening required 'D:\finagro.gov.co\www\html\plugins\activation\lib/../utils/hcemd5.php' (include_path='.;c:\php\includes;C:\php\pear') in D:\finagro.gov.co\www\html\plugins\activation\lib\ activation.php on line 24

Fatal error: require_once() [function.require]: Failed opening required 'D:\finagro.gov.co\www\html\i_portals\lib/../utils/hcemd5.php' (include_path='.;c:\php\includes;C:\php\pear') in D:\finagro.gov.co\www\html\i_portals\lib\page_item .php on line 24