I've tried installing it twice but i get this error message each time:

Installing SilverStripe...

I am now running through the installation steps (this should take about 30 seconds)

If you receive a fatal error, refresh this page to continue the installation

* Creating 'mysite/_config.php'...
* Creating /home/bari/public_html/mysite/_config.php
* Creating '.htaccess' file...
* Creating /home/bari/public_html/.htaccess
* Building database schema...
[Warning] mysql_connect() [function.mysql-connect]: Access denied for user 'bari_siluse'@'localhost' (using password: YES)
POST //install.php

Line 35 in /home/bari/public_html/sapphire/core/model/MySQLDatabase.php
Source

26    /**
27     * Connect to a MySQL database.
28     * @param array $parameters An map of parameters, which should include:
29     * - server: The server, eg, localhost
30     * - username: The username to log on with
31     * - password: The password to log on with
32     * - database: The database to connect to
33     */
34    public function __construct($parameters) {
35       $this->dbConn = mysql_connect($parameters['server'], $parameters['username'], $parameters['password']);
36       $this->active = mysql_select_db($parameters['database'], $this->dbConn);
37       $this->database = $parameters['database'];
38       if(!$this->dbConn) {
39          $this->databaseError("Couldn't connect to MySQL database");
40       }
41

Trace
o mysql_connect(localhost,bari_siluse,arg)
Line 35 of MySQLDatabase.php
o MySQLDatabase->__construct(Array)
Line 79 of DB.php
o DB::connect(Array)
Line 786 of install.php
o Installer->install(Array)
Line 123 of install.php

Part one of the set up said the database was ok:

"MySQL Database
These database details look all good! "

what do you mean by this:

"(2) your sql user has the correct permissions?"

thanks