Whenever I go to change the allocated RAM for running Minecraft then click play, the launcher starts to load, but then says an unexpected error has occured. I have also ran Minecraft without changing the RAM and it ran perfectly fine.

So I would open up my minecraft launcher like normal and change the RAM like I always do, when the whole game did not load and ended up crashing. I have tried lowering the amount of RAM I put toward the game and it still crashes, but if I just load up the launcher without changing the RAM the game runs completely normal with no problems loading or even running.