Okay so I'm new to these forums, please correct me if I am doing anything wrong. I am here because I've found help nowhere else =/
I accidently saved my game after completing For Auld Lang Syne, which I did not want to happen. I just instinctively saved my game. Well now I don't have Arcade Gannon. SO! My question is, Would it be possible to reset Arcade Gannon and the quest so that I can do the quest again when I feel like it?

I've tried resetting the quest and resetting Arcade but as soon as he spawns at me he starts walking back to the Bunker (I think). There are no options for re-hire when I talk to him. Any help will be appreciated so much, as this has put me off playing for a while now. It used to be my favourite game and I really do not wish to start again yet. Thanks everyone =]