I have no clue on what went wrong here. What does this all mean? I am unable to play the Demo Version of minecraft.

The game keeps crashing and it keeps warning me that the game is already running despite the fact that I have not even pressed the play demo button or launched the game. After clicking start anyways, an error pops out informing me that

the game launch failed due to these unknown errors. I've tried deleting it and downloading it keeps showing me the

same warning and error.