And in Fallout when you failed a quest what did you do ? Load Game and redone it.
OR
You played with walkthru
I'm sorry, I'm sorry, but what? The time I first (and actually seriously) played Fallout I had no internet connection, so that leaves out the walkthrough option. And the loading after failing? Are you serious? You do realize you can't do everything at once and you will fail a quest at one point anyway. Make another playthrough, go different routes, complete the quest there. If your OCD is so damn damned then I'll be damned you have something damned wrong in your damned brain!
FOnline alts = Fallout playthroughs. I'm sorry (yet again), but that's how it works here, and that's how it works in almost every other game.