I don't think my problem was with the shadows in the game, though I may have to risk downloading new NVidia drivers for my graphics card, if I want to risk it (They sometimes mess up Windows)
Save yourself the disk space and the $10+ tax. The game is very mindnumbing. It is too much, it really is. For instance, there are various times you will see zombies...ooops, corpses just laying on the floor. You cannot attack them, you know they are zombies. You are then "surprised" by these zombies and have to wade through a 20 minute battle, just so you can get to the next one.
The end battle was horrible. I went through it three times. I really did not even know I was at the end battle at first. I won with two character deaths. So, I reloaded it and came through with zero character deaths.