I'm having the same problem. I WANT THE AWESOME MOD OFF MY COMPUTER but it won't go away. I uninstalled and reinstalled my game. I've looked through all my files to try to find the stupid mod. I"ve deleted things. I keep getting that "core mismatch" and "flagrant system error--expiration" thing. Someone, please, tell me how to get rid of this thing once and for all. I wish I had never tried installing it.