HAHAHA. That's funny man. I have a solution for you though.

First of all the game got half uniinstalled so what you need to do is delete it from the astual file. You have to find Total War file and delete it.

Ok now pop in your CD and open My Computer and then right click on the CD driver and click on open.

Then open up the Setup NOT the Autoplay. And there you go. Problem fixed.