This is what I understand:
You had a Joomla! site. You installed Admin Tools Professional. You created a .htaccess file using the .htaccess Maker. You installed WordPress in a subdirectory of the site. WordPress' admin doesn't work.
If this is the case, you need to add WordPress' directory to the list of exception directories (the ones which allow all PHP files as well) and then click on Save and Create .htaccess. Admin Tools' .htaccess is optimized for Joomla! and Joomla! only. Any and all other PHP scripts and applications (WordPress, Drupal, you-name-it) won't work with it and have to be added to its exceptions list.
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!