There's another user in the General Help section with the same problem, and I told him the same thing as everyone else has said in this thread. To reinstall CA.
You also have to make sure to clean your CA folder now and then. Make sure there's no previous hacks/public hacks in your CA folder. Also, try updating the HS files manually in the HS folder, once you've removed any previous hack files. Then try to run the game again. It might save you from reinstalling.