CluelessDino

I've been trying to find a way to fix my minecraft for 2+ days.. I'll open the minecraft launcher and get it to the main screen and it'll be running good, but when I try to load a world it'll say "building terrain", and then itll say 0% , then crash. It seems when I figure out one problem there's another one followe by it. When it crashes it says, "an unexpected issue occured and the game has crashed. We're sorry about the inconvenience". Note: Game has mods downloaded with forge