Hi there,
With a Quad Core CPU you don't need to enable the unlocking feature and doing so can in fact lock off some off the cores, as you have discovered.
With regard to your CPU temps they seem a trifle high, considering the cooler you are using and I would suggest re-seating it to make sure it is making proper contact with the CPU.
I am running an 1090T X6 Phenom with a slight O/Clock with the Noctua NH-D14 cooler and my idle temps are around 20C - 24C. Rember though, that the ambient temperature will have a bearing and here in teh UK my room temp is about 20C.