The Wordpress installation procedure is IMHO needlessly complex when talking about using wordpress from the root of the webserver:
If you want to integrate WordPress into the root of your domain (e.g. http://example.com/), move or upload all contents of the unzipped WordPress directory (but excluding the directory itself) into the root directory of your web server.
If you don't mind having your wordpress installation directory showing up in links to individual blog posts or other links deep into your blog, there's a much simpler way of integrating Wordpress and much less clutter in your webserrver root directory
Copy the index.php file from wordpress install directory to the webserver root directory. Open the file in your favourite file editor and change the following line from
if you installed Wordpress into the wordpress directory.
Then www.example.com will open your blog just the same as www.example.com/wordpress would.