Install php and crate a dir in c:\php
and copy the unzipped file there
Copy all the dll's under php to c:\windows\system32
reanme php.ini-dist to php.ini and put it in path c:\windows for example
Also in php.ini add support to mysql
"As with enabling any PHP extension (such as php_mysql.dll), the PHP directive extension_dir should be set to the directory where the PHP extensions are located. See also the Manual Windows Installation Instructions. An example extension_dir value for PHP 5 is c:\php\ext"
In the Apache httpd.conf
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule php5_module "c:/php/php5apache2.dll"
AddType application/x-httpd-php .php
AddType application/x-httpd-php .php3
AddType application/x-httpd-php .php4
Then set permission to
# This should be changed to whatever you set DocumentRoot to.
Options Indexes Includes FollowSymLinks MultiViews ExecCGI
Note - check the security risk here
Also note remove .php from AddHandler, otherwise you get errors from apache saying error 403 Forbidden
ScriptAlias /cgi-bin/ "D:/Program Files/Apache Group/Apache2/cgi-bin/"
AddHandler cgi-script .cgi .pl