If youve configured vhosts in Apache and you know some php youll know what I'm talking about.

When ZenCart starts up it does a lot of checks on the defines in the configure.php. If theres a problem, it throws up the Install ZenCart page or something like that.

Looking at a web page isn't going to help you. You need to trace the code.

When I get my debugger configured, I'll tell ya where.