GD Library .dll problem

Hello I am trying to get my PHP running with the GD Image library also. I am running NT 4 with PHP4 installed (ISAPI). I have a pre-compiled version of the GD Library which I found on the internet (as I have no idea how to compile the source myself). I read in the installation notes of PHP4 that to install the .dll's you place the file in your windows dir, and add the line to the php.ini - so this is what my php.ini looks like: extension_dir = "c:\WINNT\" extension=php_gd.dll And i have made sure that the php_gd.dll file is in the "c:\WINNT\" Directory. The problem is that when I remove the ; from before the "extension=php_gd.dll" (to uncomment it) my IIS doesn't start up properly, and I can't restart it any way apart from restarting my PC. Has anyone successfully installed the php_gd.dll file ? If so - How? Thanks Tom Peck