You said that you uploaded the files to the public_html directory on your server. It sounds like you never actually did an install. If that's the case there wouldn't be a config file created yet. It will depend on what you actually uploaded to determine what you need to put in the browser to start the install. If the public_html folder on your server contains a folder called admin then you should be able to enter
www.yourdomain.xxx and it should detect that an installation is required. If the folder in public_html is something like zen-cart-v1.5.1-full-fileset-09182012 then your should enter
www.mydomain.xxx/whateverthatdirectory is.
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