Error installing Concrete5

I’m new to this world of websites and I’ve just registered on DreamHost. Every time I try to install Concrete5 I receive an email saying “There was an error while installing Concrete5 on your site. The problem was directory (…) is not empty! Please re-install, specifying an empty (or new) directory.” How do I do this?

When you create a new domain, DreamHost will automatically place a few files there saying that a new DreamHost site is coming. FTP to your site and delete them.