i have the exact same problem,
first time i try to start walking dead it gives a walkingdead101.exe problem.
then after clicking on it like a retard it starts up in a window and i have to change my video preferences in the game again to full window mode etc.
then i wanna go on after having played 1 hour but wait! no save games, this game doesn't save :S tried to clear cashe / reinstal etc didn't work
my laptop is windows 7 updated, ati radeon HD 4570 newest drivers.
plz help, i really like zombies and i really like the game so far.