You cannot install more than one script in the root directory of a domain - Fantastico Error Message
After trying to install wordpress on one of my domains today I got the following error message:
Install WordPress (2/3)
The installation can not be completed:
You cannot install more than one script in the root directory of a domain.
Click on the browser’s Back button to fix reported errors.
This really annoyed me, so I did a little bit of searching and found out that fantastico left a file from a previous installation.
To resolve this simply following these steps:
1. ftp to the main directory you are attempting to install and remove any existing files
2. You will need to delete a file called installed_in_root.php (contact your webhost to remove it since you probably will not have access to it)
If this doesn’t resolve your probably you should contact your web host and they should fix it quickly since it’s a common problem.