Adding GD extensions

I am migrating from the Mac world and so my knowledge of the Windows environment is minimal. I have two systems. A desktop running Windows 2000 v5 SP2 with IIS 4 and a laptop running Windows XP and Apache 1.3 I have php running on both as a CGI. When I try to add any extension to php via the php.ini file I get this "Unable to load dynamic library 'C:\PHP\php_<extension_name>.dll' - The specified procedure could not be found." I have the php.exe and the .dll's in the C:\PHP directory. Is the reference to the specified procedure a reference to the .dll or is it a procedure being called by the .dll when trying to load? I am ultimately trying to add the image functions to php using the php_gd.dll I read on the GD site that I would also have to have the jpeg-6b, zlib and Freetype extensions. Is there an exe for php with these already loaded? If not, where do I find a step by step procedure to build the required configuration. The step by step instructions will probably have to include explanations since my knowledge is minimal. Thanks Mike Ellis