B3NHAM1

Hey guys, Need some expert help here! Downloaded hexxit, played it for about 10 mins fine. Quit the game then i went to load it back up, the mojang screen appears and then after that all i get is a white screen. Deleted the files and went for a fresh download and the same problem is happening. Apperently this has happened to other people as well but people are saying they need to update files but im not 100% sure what im doing. Any help would be great so i can start playing again! Cheers