Can't play SP mode try this, it worked for me!

[Larhook]

Run a google search for "COD4 no dvd patch". I downloaded a rar. file which when you unzip it has a smaller "iwpsp" file in it. Just take the exsisting iwpsp file and move it somewhere safe and replace it with the patched version. Believe me I tried everything including activision support, this worked !

[bbfYoUGoTServeD]

Well, I'm going to try this one too, tried everything else and I still haven't played the SP yet. I don' really want to, but everyone said I'm missing out. So, I'll try this tonight. Thanks.