It might be the CD itself, the CD/DVD drive, or other programs hogging up resources and memory. Try another CD and see if it does the same. Also, try ripping without other programs running in the background to free up memory.
Well, you can always change the fan ... on another note, my friend's TrueControl 550 just died after 3 months of use. He's currently making the switch to PC Power & Cooling.
If you're o/cing, then bring it back down to defaults. It might be that it's too hot ... I think I've had this problem also b/c of the SATA drivers. I was trying to reinstall XP, but it kept freezing in the middle. What I did was just do a fresh install. I don't know if this helps, but...