Ok so I bought the disk from walmart, got the game home tried installing it and its asking for steam activation code. So i search the case it came in, inside the booklet, the map, everywhere, no steam code. What am I doing wrong, or did I just get ripped off?

Return to the store.Steam Code is usually behind DVD.

thats just great considering i just drove 30 miles one way to buy this game at 3:00 am...