Windows itself is not going to know the temperature unless the hardware is reporting it. More to the point, this is going to be interacting with hardware and not some part of the Windows OS speedfan is what I use to monitor my temps on my motherboard. But one of my other machines does not report this information (or speedfan doesn't know how to handle it). If you can see temps in the BIOS, then obviously your computer is tracking this information. However, I know that sometimes those numbers can be inaccurate. I have a machine that my BIOS said runs at 100C, and has ran that way constantly for 2 years... it is a celeron 766 with a huge fan/heatsink and has external airflow. The whole point is you're limited to accessing what the hardware is providing you.