Apache needs to be configured to recognize index.php as an index file.
The simplest way to accomplish this..
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Create a .htaccess file in your web root.
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Add the line…
DirectoryIndex index.php
Here is a resource regarding the matter…
http://www.twsc.biz/twsc_hosting_htaccess.php
Edit: I’m assuming apache is configured to allow .htaccess files. If it isn’t, you’ll have to modify the setting in apache’s configuration file (httpd.conf)