Ok, thanks for all your help anyway. I'll wait and see if Jason or others may have a solution. In the meantime, I am going to ask the guys over at Emumovies about that issue with the videos, I don't think the ones it grabbed for my other systems are HQ either and I have spent the weekend setting up all my systems. I hope there is a way to replace with HQ versions without starting everything from scratch if these are standard quality. If I had to set it all up again I think I would go insane! lol
EDIT: I changed the emulator for the arcade platform to the latest MAME RetroArch core to see if it made any difference but it still launches behind Big Box, with it's horrible blurry graphics