Ok, this likely has to do with the included .htacess file. There are several possible syntax(es? what is the plural for syntax

) you can use. Which one to use, depends on your version of Apache, and how PHP support was added to it.
Some of the known variations are ...
<Files directory>
ForceType application/x-httpd-php
#SetHandler application/x-httpd-php
#SetHandler application/x-httpd-php5
#ForceType x-httpd-php
</Files>
Check the
FAQ for further details.
If none of these variatiosn work for you, then possibly your web server uses a different syntax, contact your web host provider for the exact syntax (and please let us know what it is)
It's also possible that these directives simply aren't allowed on your webserver. In that case I can only suggest asking your web host to enable it for your installation. Details on that are also in the
FAQ