This game had huge hype and it produced errors like these even after the patches released.. Ok time to rant..
The game had a tralier out for approximately 6 months. The hype was massive, and the developers promised a new form of zombie killing war zone to play in. What is the use in making any promise when a user has to edit text files just to start teh game, of which isn't officially in documentaoin by the game developers, and on some side online fix.
Getting into the game, at first the game was only supporting 4"3 resolutions... how many monitors are even 4"3 anymore. Then it had it's multitude of graphic and texture issues, including terrible support for many drivers.
Gameplay and online were next to not so hard to have ot nitpick at. The first patch released out had 3 major issues, CO-op saving was non existant as it worked 1/10 of the time and when it did the nexts time you trieid to save would corrupt the save. Then, gameplay itself had many bugs riddled throughout, one where I couldn't pass a doorway becuae of bugged dead zombie.