Something else you could try is the following:
Extract the php distribution to C:\php and copy the php.ini to c:\windows\system leaving all other files in C:\php. In the php.ini, set extension_dir = ./ Now make the following changes to httpd.conf:
ScriptAlias /php/ "c:/php/"
AddType application/x-httpd-php .phtml
AddType application/x-httpd-php-source .phps
AddType application/x-httpd-php .php
Action application/x-httpd-php "/php/php.exe"
If all this fails, you can grab a Windows installation from www.opensa.org. This package will install Apache/1.3.12, mod_ssl/2.6.2, OpenSSL/0.9.5, and PHP4 RC2. All you'll need to do once this is installed in upgrade PHP to the latest release. Their server has been experiencing some problems for the last few months so if you can't connect you can grab the package off my ftp:
user/pass: opensa/opensa
host: 205.251.211.185
port: 21
Hope this helps!!
Cheers,
Geoff A. Virgo