Need Cd for game play

I have Halo downloaded on my HD and I have the CD key, but it is asking for CD 1 (which I lost) to be inserted into cd-rom. How do I play the game without the cd?

Do you mean downloaded from the internet, an image made from your original cd or that you have simply installed the game?

I downloaded it from the internet and I have no original cd.

Then I’m sorry but we can’t help you. This is a warez free forum. Please re-read the forum rules that you agreed to when you joined.