If you provide me with more information maybe I can guide you. Can you please tell me the versions of Joomla!, Admin Tools, MySQL and PHP you are using? Also I don't understand something. You say that you have a problem installing Admin Tools, but on the second paragraph you say you have installed Admin Tools Professional. This doesn't compute as having installed the component means you can't be asking for help installing the component - unless I am missing something here :) Should I assume that you tried installing the other components and AT Pro on a different site?
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!