I believe ECC stands for Error Correcting Code Memory, or Error Checking and Correcting Capability. It checks data for accuracy as it passes in and out of the memory.
What are your options in BIOS, ECC on/off/auto?
Just turn it off. ECC is a function most used in servers and workstations, as household DDR2 doesnt see many soft errors.
As far as AMD Live!, here is what it consists of: AMD Live! - Wikipedia, the free encyclopedia
. If it was me, i'd leave it disabled, but if your into all that then it wouldn't hurt to enable it i suppose.
I would leave Cool n' Quiet disabled unless you prefer the power saving features of it lowering the clock rate and voltage of your CPU. I never fancied that.