Your problem is (as suggested in the comments) Apache has no idea "how" to run php, so it is just giving you the raw php files. You need to install PHP if you haven't, otherwise, if you have installed php you need to configure apache to use it.
If PHP is NOT installed
Go ahead and google it, there are a ton of resources out there explaining how to do it.
A good thing to look for is the WAMP stack. Which stands for Windows, Apache, MySQL & PHP. There are many places showing you how to install each of these individual components.
If PHP is installed
The httpd.conf
file needs to be modified to include PHP.
Add the following line after all of the LoadModule statements:
LoadModule php5_module "[PathToPHP]/php5apache2_2.dll"
Search for AddType, and add the following after the last AddType line:
AddType application/x-httpd-php .php
Add the PHP location to the end of the httpd.conf file. For example, at the end of the file, add the following:
PHPIniDir "[PathToPHP]"
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