I'm afraid that this a back to your host issue.
From the public side of your server I can see that the URL I would expect to use to access your Zen Cart dynamically in your site's root (http://delightfullyxquisite.com/index.php) doesn't, and the static location to which sites redirect when there's a problem (http://www.delightfullyxquisite.com/nddbc.html) isn't there either.
This could mean that:
Unfortunately, although 3. is the most likely scenario, we can't see what's happening from the public side of your site (which from a security perspective, is a good thing).
- public_html isn't your site root (unlikely)
- that your site isn't in public_html (but you've already told us it is)
- there is some redirection and/or URL re-writing going on in the site root



