I just switched my domain to dreamhost, and installed WP 3.3.2. The message in my email from wordpress tells me create an admin user at: http://www.cambodiareads.org/wp-admin/install.php
When I go there, I get a 404 error. When I just check the url, my old site is there (not wordpress) that was transferred from the old host.
I found old topics on this subject and checked that index.php and other files are there, and also renamed the plugins folder, but nothing works.