According to both of the screenshots you've posted there are two things I note:

1. The exact problem is being told to you in point #3: /includes/configure.php not found. You should not be ignoring that message.

2. zc_install doesn't have any facility within it to call the error screen that's being displayed. Thus it's somehow pulling it from the main folder. I'm guessing that this is a symptom of a server which isn't configured to handle relative paths?

How exactly did you install and configure PHP on this server?
How exactly did you install and configure the webserver engine on this server? And what permissions does it use? What user does it run as?

Have you tried using a traditional webserver build by a hosting company who sets up usable webservers on a daily basis? With respect, one very common problem I see with people starting with ecommerce is that they quickly slap together a server thinking everything should just magically work and then we discover after days of painful diagnosis that the problem is their homegrown server, and nothing at all with Zen Cart or the Zen Cart installation instructions.