Unbelieveable,
this is exactly what I did and it works for me perfectly. Which version of php and apache do you use (I installed apache 2.0.45 and php-4.3.1).
Make sure that there is no older php4ts.dll in your system32 directory or something like this. Did you install apache as a service or do you start it in a console. Look for errors in the error_log of the apache server.
Did you install the installer package of php or the one packaged as zip file ?
Make sure that the engine is enabled in the php.ini (engine=on),
but I doubt that this is the problem since the engine is enabled per default in the php.ini.
Did you modify your php.ini