Just found the answer - thought ı'd post it for anyone else to read:
Installing as an Apache module
You need to insert these two lines to your Apache httpd.conf configuration file to set up the PHP module for Apache 2.0:
Example 6-6. PHP and Apache 2.0 as Module
For PHP 4 do something like this:
LoadModule php4_module "c:/php/php4apache2.dll"
Don't forget to copy the php4apache2.dll file from the sapi directory!
AddType application/x-httpd-php .php
For PHP 5 do something like this:
LoadModule php5_module "c:/php/php5apache2.dll"
AddType application/x-httpd-php .php
configure the path to php.ini
PHPIniDir "C:/php"
Note: Remember to substitute your actual path to PHP for the c:/php/ in the above examples. Take care to use either php4apache2.dll or php5apache2.dll in your LoadModule directive and not php4apache.dll or php5apache.dll as the latter ones are designed to run with Apache 1.3.x.
This was found on the PHP site : http://us3.php.net/manual/en/install.windows.apache2.php