Sims3 won't close

So I've tried force-quitting the game and it still won't close. Because it's still open I can't shut down, restart or log out of my computer. I've tried multiple times to let the battery die but as long as there's the tiniest bit of power left it just goes to sleep. Because I've tried to force quit and shut down but sims 3 was still open, I can't do anything on my computer as it thinks it's closing down but the sims 3 being open will prevent it from doing so. I'm done with this game and the fact that I can never play it cause it constantly crashes. Any suggestions on how to finally get it to close would be super helpful! Every manual over ride I've tried hasn't worked.