After trying to log in, Members get 404 error

I noticed that I had duplicates of every Protected Content page (Registration, Protected Content, etc.),so i deleted some.
I still have:
- Account
- Memberships
- Protected Content
- Register
- Registration Complete

So, I think I cannot claim innocence, and I suspect this is the problem, but I don't know for certain. And, I don't know how to fix it.

Now, when my member tries to log in, they receive this error 404 message on this page: http://tinnitussynergy.com/protected-content-2/login

I granted access.