You may not be able to add temp sensors in Vista with the current version of CC2. When I installed Vista and CC2, I saved my ini files from my old XP install. I just copied them over and all worked just fine.
If you are starting from scratch, you may not be able to add the sensors, since CC2 can not see "behind" the scences, so to speak... Unfortuantely, I can't verify whether this works or not, so if you can't add the sensors, you will have to wait for Vista-compatible version of CC2.
I have played with a preliminary beta version, so it is in the works...
Now, if you just want to use a program such as Speedfan (MBM replacement), should be np.
JC