As I've said, IF the problem it's in the scenery.cfg being corrupted, either you KNOW how to fix it, or you should remove it, so FSX will create a new one. But of course, if FSX creates a new one, it will only contain default scenery areas, so every scenery will either be reinstalled, or its area should be manually added, which might be complex, but it's not there are any other choices, if you don't know how to fix it.