Thanks!
"Thanks so much for your reply, I hope it helps in some way, the 64-bit kernel (pure) always kp on acpi, but I know that's how it was for snow leopard too, maybe it will work for some processors, but I am currently using 32-bit kernel, and system seems smooth, although the only thing is I am doing school work, so I don't want to take chances leaving XPCHelper running, you know?
maybe this will fix it, maybe not "