Help me installing wordpress in root directory.

Hi,
I’ve a domain http://www.hostpk.info and I wanted to install wordpress in its root directory.
First I installed wordpress in a sub directory using fantastico and tried to installed Joomla in root. But there occurred some error and fantastico was not installing any other CMS in root and also not uninstalling and removing Joomla. So I removed Joomla’s many files manually. Now I uploaded wordpress in root and tried to run the install script but nothing is working.
wp-config.php is ok and upload is fine but nothing is working. All I get an under construction page at index.
I’m a newbie and I messed up all this and I don’t know how to get off of it, can someone please kindly help me.