hi, Rincewind,
i have the similar problem with charlotte...
i have install XP is C drive, php, mysql and apache are installed in D drive. I have already done the modification of the httpd.conf you mentioned before, but will I http://localhost/test.php, it prompt a download msg to download the test.php file.
also, when i type http://localhost/, a NOT ACCEPT page is shown. Do you know how can i fix it??? thanks!