minecraft launcher isent loading game

whenever i try to open minecraft it will load but then straight after it loads it instantly crashes for no reason at all and no matter what i do i cant stop it and this has been going on for about a week now. i dont know if its a problem with my pc or with the launcher and its not for a specific version of the game because i have tried to play all the other versions. please tell me if theres any way i could fix this. it does say that i was using forge in the crash report but i also tried just normal minecraft and it still dident work.