Clearly you've got a totally confused set of files on your server. So delete them and start clean. I can't help you without knowing all the details of the mess you've got right now, so starting clean is the fastest and smartest way.
Backup your 1.5.0 database data for safe-keeping, because you'll need to restore it later.
You'll need the database username/password/etc info that's in your current configure.php files, too.
Uninstall your current Zen Cart using the Fantastico uninstaller. And then wipe all traces of whatever it left behind, by deleting any files it left in whatever folder it had installed into.
Download a clean copy of Zen Cart. You'll find the link on the www.zen-cart.com home page.
Unzip it.
Then upload the unzipped set of files.
You'll find installation instructions in the /docs/ folder, in two forms: When viewing /docs/index.html from your browser you'll see links to install instructions ... and/or you can view the /docs/Implementation_Guide.pdf file for detailed instructions and lots of extra important implementation instructions.
Once you've got a clean install of Zen Cart working, and can login to the admin etc, do a quick backup of the temporary data that's now in your database.
Then restore the backup you made prior to this re-install. Then you can login to your admin using the admin password you had in the backed-up database.
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