You may of already solved this but it if not, then first from what I remember you need an ending slash in this line:

PHPIniDir "C:/php" -- should be
PHPIniDir "C:/php/"

Secondly have you setup the environment variable in windows ?

For PHP to work with Apache and to make the CLI available from any command prompt window, you need to add the PHP folder to the PATH environment variable.
Unless you try something to which you have not already succeeded ~ Then you shall NEVER grow