bobodunno, you're a legend. :mrgreen::cheesy::mrgreen:
For anyone experiencing this error, this is what I did by following the link below which solved the issue (running on WinXP prof sp2):
1. Follow the link below
2. Download the latest WIN32 package snapshop which is a zip file.
3. Extract ONLY the php5apache2_2.dll file from the zip archive into your PHP install folder (I also extracted php5apache2_2_filter.dll, not sure if I needed to)
4. Double check your PATHs in httpd.conf are correct, save it and then restart Apache2.2
Originally Posted by bobodunno
What you need is php5apache2_2.dll, which is compatible with Apache 2.2. The file is available in the PHP 5.x snapshot at http://snaps.php.net/