I know this a post from 3 years ago, but I'd like to add on to what Diablu has stated since this is one of the top links when you search for this problem. If deleting the mg07 vision scripts isn't working you can change the value of one of the scripts that are set to 0 to 1 using the Hadoram's Save Game Script Cleaner; I suggest you make a hard copy of your save before you use the program. I didn't realize the Magnus Quest could bug out so horribly to the point where it creates random CTDs. You'll be basically be doing what steve40 suggested only though a 3rd program.