by Ken Task.
That sounds like the DB user you have in config.php of the site, doesn't have rights to alter the DB for the moodle.
So in your cPanel/Other Panel, look for a tool that sets privs for users and grant that user the ability to alter the DB.
Basically, the DB user for the moodle needs all.
There is a mdl_config_plugins table that also might be in need of carefully removing any rows relate to those plugins.
'SoS', Ken