Game crashes after starting

I've started playing around with mods recently and the reason im not going to a mod site is because this is not directly a mod problem. I have downloaded Forge and a couple modpacks, at first my forge was out of date so i updated it, next i had a modpack that was for an older version so i got rid of that, now when i start the game and hit Play it starts the normal forge startup then it gets almost to the end and the iconic "Java(TM) Platform SE Binary has stopped working" then i get the error code 255 or -1073740940, when i go back to my other user the game works fine, so i know its something to do with forge but, it's in the launcher so i don't know what's going on