[php mysql extention not loadable access denied]

am having issues, sombody please help

PHP Warning: PHP Startup: Unable to load dynamic library 'C:\php\ext\php_mysql.dll' - Access is denied. in Unknown on line 0
[a href=\"http://portlandz24.dyndns.org/info.php\" target=\"_blank\"]My Webpage php info[/a]

system- microsoft server 2003
inet server- IIS 6
php- version 5
mysql- version 5

libmysql.dll and libmysqli are in the :\windows file
; Directory in which the loadable extensions (modules) reside.
extension_dir = "C:\php\ext"

;extension=php_mbstring.dll
;extension=php_bz2.dll
;extension=php_curl.dll
;extension=php_dba.dll
;extension=php_dbase.dll
;extension=php_exif.dll
;extension=php_fdf.dll
;extension=php_filepro.dll
;extension=php_gd2.dll
;extension=php_gettext.dll
;extension=php_ifx.dll
;extension=php_imap.dll
;extension=php_interbase.dll
;extension=php_ldap.dll
;extension=php_mcrypt.dll
;extension=php_mhash.dll
;extension=php_mime_magic.dll
;extension=php_ming.dll
;extension=php_mssql.dll
;extension=php_msql.dll
extension=php_mysql.dll
;extension=php_oci8.dll
;extension=php_openssl.dll
;extension=php_oracle.dll
;extension=php_pgsql.dll
;extension=php_shmop.dll
;extension=php_snmp.dll
;extension=php_sockets.dll
;extension=php_sqlite.dll
;extension=php_sybase_ct.dll
;extension=php_tidy.dll
;extension=php_xmlrpc.dll
;extension=php_xsl.dll