PHP with GD

First off, I've looked all over to try and solve this on my own and, for whatever reason, I just cannot get this to work. Everyone just keeps repeating what the install files say and that's not helping me. Ok, I'm running Apache 2.0.49 on Win XP with a manually configured (zipped) PHP 4.3.7. I believe I have the basic PHP up and running. I've tested a variety of different code samples and they've all worked. Now, I'm trying to enable the GD library bundled with PHP. I've set the extension directory in PHP.ini to:
extension_dir = "c:/php/extensions"
This is where my PHP and extension directorys are, so this should be fine (and php_gd2.dll is in there). Under dynamic extensions, I've removed the
";" before the extension=php_gd2.dll.

According to everything I've found, this should be
all that you have to do. Well, it's not working.
So, there must be something else that I'm not doing. Any help will be much appreciated. Thanks!