Try set the correct path in PHP.INI at extension_dir.
This is part of my php.ini
; EXTENSION DIRECTORY
extension_dir = "D:\programs2000\PHP\extensions\"
; EXTENSIONS
;extension=php_bz2.dll
;extension=php_ctype.dll
;extension=php_cpdf.dll
;extension=php_curl.dll
;extension=php_cybercash.dll
;extension=php_db.dll
;extension=php_dba.dll
;extension=php_dbase.dll
extension=php_domxml.dll ; <-- Enable the module
;extension=php_dotnet.dll
;
I hope this is helpful