IS it the tutorial from how to make a D3D Menu? If so my menu injects fine and doesn't crash even with other games. <- or did you try adding something hack related to it for CoD4?
OR is it the one where he shares a hack with ESP,AIMBOT,SNAPLINES and so on? <- this works for the current version of CoD4 and I have Windows 7 x64 bit
and do you have a legit copy of the game? because that probably matters most