It looks like you riún the ISPConfig installer more then once without uninstalling it first. Please run the following commands to uninstall ISPConfig:
rm -rf /root/ispconfig
rm -rf /home/admispconfig
Then delete the ISPConfig mysql database. ISPConfig will recreate a new database. If the datbase exists, the installer will fail.
Now unpack the ISPConfig installer tar.gz file again and run the setup script.