problem with napoleon tw

hi i just bought Napoleon total war but when i start the game ,it crashes immediately!
what i did is this:
i put in disc 1
i dubble clicked on setup.exe
steam downloaded the needed data
but when i finished downloading the problem appeared....
the folder of napoleon tw is not installed in the folder of empire total war so maybe that's the problem.

It could be. Verify your game cache via Steam.

thx

You're welcome.