Configuring PHP. php.ini does not do what it should

HI there, I am trying to get gdlibrary to work. The .dll on windows are in the extension directory and the comment tags in the php.ini are deletet. I always get the error message, that the file c:/PHP_404/extensions/php_gd.dll cant be found. But it is there! Here is the line out of the php.ini. ; Directory in which the loadable extensions (modules) reside. extension_dir = c:/PHP_404/extensions Is there a precompiled version of php with gdsupport included? What would be my best bet to get in running? Thanx in advance, andy