If it's just the leveling that's bothering you try to get a friend to help you for the time being, or maybe solo in the 6x abyss ?
You've not done something simple like being in the uruga Forest perimeter because that only have the 60 70 80 abyss, and if you thought it was the low level one then the 50 abyss would be missing. I'm not trying to insult your intellegence but it is a small possibility xP
This "Manipulation of Files" Can happen only when you tinker with the inner workings of Fiesta itself. Perhaps you tried to delete a single file, Or maybe you tried to INSTALL a single file
Who knows? Keep reinstalling. Only option. But your gfx Card is lookin' like it could see better days.