There are two more tweaks, for running PHP under Apache and for error logging. Within your text editor, search for DirectoryIndex:
DirectoryIndex index.html index.html.var # index.php
To have Apache serve PHP pages, remove the comment character (#) in that line. You should also permit the use of .htaccess files in any directory: search for an AllowOverride setting and change it from None to All. Save the changes made so far, and leave the file open in the text editor; more changes are needed once PHP is installed.
If a setting triggers an error, the error may log to [APACHEDIR]\apache2\logs\error.log but more likely will log only to the Windows Event log (Start | Settings | Control Panel | Administrative Tools | Event Viewer), which is not a convenient tool for debugging installation settings. It is much easier to test Apache 2 in a command line window, where error reports appear instantaneously. So open a command line window, navigate to C:\Apache\Apache2\bin, and make sure you can start and stop Apache from there:
httpd -k start
httpd -k stop
In Apache 2.0 the command is apache; in 2.2 it is httpd.
If you prefer, right click on the desktop My Computer icon, select Manage, open Services and Management, click on Services, right click on Apache, and select Start. Read More - www[dot]artfulsoftware[dot]com/php_mysql_win.html