You bought a non-download version on Amazon? What, a CD? I didn't know they were selling such. It's probably one of those CDs that just allows you to download it from Steam, though. Which, as you've discovered, requires the missing Steam code.
As Schmoekoeksklok said, try to return it. Not going to do you much good without a Steam code. IIRC, though, you're still going to have to download most of the game when/if you do get it. So if download speed is an issue for you, you may have another problem.
I doubt you'd have to change the refresh rate, though, or monkey with any of the settings when/if you are able to download it. If you do have issues, post in the tech support forum after you get your key. Andrew should be able to help you.