This happens to me if I have ever had to restore my computer. (Every time we have a power cut, which is all too frequent in my area.)
Your game is playing correctly apart from the unplayable files?
Do you also have WA installed?
If this is the case, the solution could be fairly easy. Go to the "Fixing/Recovering Saved Game - Saved Game Not in Game Launcher or Corrupted" sticky above. Reply 87. It does not take long to do and should make the game playable.