GD2 Installation

[Fearpig]

Hello everyone,
I've run into a problem trying to install the GD2 extension. I have the following lines in the php.ini file:

[code]
; Directory in which the loadable extensions (modules) reside.
extension_dir = "C:\PHP"

extension=php_gd2.dll
[/code]

I have the php_gd2.dll file in C:\PHP, I have restarted my web server. At this point there is still no sign of GD2 using phpinfo();
I am running PHP 5.1.4, IIS 6 on a Windows 2003 Server.

Can anyone see or suggest where I'm going wrong?
Cheers Tom.