dealbyethan.com:
Before installing admin profiles we remember it was working.Great.
dealbyethan.com:
After installing admin profiles, it has stopped working for some reason.Aha, a clue.
dealbyethan.com:
We then uninstalled admin profiles but the problem is still there.That suggests you didn't fully uninstall everything.
All files. All database settings. Etc.
dealbyethan.com:
How did this happen? What do we do to make the admin settings accessible again?
Good question. And exactly the reason why one should always test addons on a test version of one's site, and never on a live site.
Backups are good, and very important, and often useful for recovering from problems such as this. However, if you had tested on a test site first, you most likely wouldn't have run into a problem on your live site like this.
dealbyethan.com:
What do we do to make the admin settings accessible again?Back to the bare basics. This is what I would do if it were my site: http://www.zen-cart.com/wiki/index.php/Troubleshoot_-_Diagnosing_Obscure_Issues