I was at vault 3 when i got killed it went to load previous save and froze after waiting two minutes i restarted my xbox when i got to the loading screen for fallout i pressed continue froze again rebooted tried to load a seperate file a pop up came up saying this save is missing important downloaded able content and said i could continue and it said load cancled due to error need help what do i do

Welcome to the club. We're all experiencing this issue at the moment. The game is busted and the devs are looking into it. Check out some of the other threads around here for other stories about how we can't play it either.