Every time I close a program or a game the RAM is still high, like if I was still using it.
For example I start my PC the RAM is at 48%, I start a game then close it, RAM stays between 87% and 99%.
I have 6gb of RAM.
Running Windows 10.
Try opening task manager, finding the process for the game, and ending it.
For windows 8 + 10, it might be in the Details tab instead of the Processes tab.
Also, this should be in the windows 10 forums.