Getting extensions to load in Win32

I am having a devil of a time getting any extensions to load on my Windows machines. I have the php.ini set up as follows: [...] extension_dir = C:\PHP\extensions [...] ;extension=php_fdf.dll extension=php_gd.dll I'm trying to load the php_gd.dll, but I get the same problem with any of the extensions listed in php.ini. The files are present, I have the directory set up in php.ini, but php won't work at all until I comment out the extension line again. Any suggestions? Thanks.