I have installed Joomla 2.5.4 with Filezilla and removed all the warnings I followed the installation instructions and have checked the database with the checker. Now when I remove the installation folder as instructed I cannot get into the site administration to complete
the installation. I get this Database connection error (2): Could not connect to MySQL.
Any Ideas?

yea go to http://mysqlquery.zymichost.com/connectionchecker.php as stated in the livechat when you joined and see if you get any errors, if not then check the config file and fix the mysql connections settings