I have been told various ways to approach a company with an idea or concept for a game. I know I need to get our material copyrited. I have sent numberous emails to companies but no reply, am I going about it the wrong way?

If all you have is a concept then read this http://obscure.co.uk/faq_idea.shtml.

If what you actually have is a proto-type/demo then read this http://obscure.co.uk/the_pitch.shtml and this http://obscure.co.uk/demo.shtml and this http://obscure.co.uk/acquisition.shtml.

If none of those apply you need to give details of what it is you actually have and what you are trying to do with it.