Disable wordpress back end for subscribers.

When a user registers or logs in I don’t want them to go to the back end, or even have the option to, just like a normal non-wordpress site would work. Obviously I still want the admin to be able to access the back end though.

Can I do this with basic wordpress options, or can you give me a plugin that’ll do it, or do I need to write a redirect hack (if so, give example code).

Thanks.