Re: Can't install
You don’t have the database details correct. Maybe you need to add a database host name. When you are installing, on the page that asks for the database name, username and password, there is a checkbox that says “show advanced details” or something like that. If you click that, you will be able to change the host name from localhost to your host. If you’re database is actually on the same server and localhost is correct, then one of your other details is incorrect.
What details did your host give you for the database connection (is there a host name there?) Also, what host are you with?
My bet is you need to enter the hostname, but you don’t even see the place to do that until you click the box.