CPU X4 CORE UNLOCKING HELPPPPPPPPPPPPPPPP

Okay, when I started my computer, I accidently press 4 to core unlock. Right now I got a Phenom ii x2 545, and when I log in, all my program crashes, and all those wierd stuff. I cant seem to find a way to "un" core unlock. I have an Asus m4n68t-m v2 motherboard. Yes, I will core unlock later on. But right now I need to be stablized back to x2, or at least my computer start being normal. Please, I need it quick before the weekend! (I also posted another one for the motherboard section just incase for any asus motherboard users)