I noticed that I changed the /admin/configuration.php file by mistake. I went back and changed that.

I have the 2 configure.php files to read-only now, as well as the zen_install folder renamed.

I still get the error when logging in! Do you think it could be something with the server?

The domain is registered at yahoo and I changed the nameserver and the mx records to use 1&1's, so it is now using the 1&1 hosting service as an external domain. Could this be effecting it?