ok so I saw this a while ago as well, but couldn't responde at the time. the best course of action I can suggest is to get us all the info you can.
Fill in your system specs: http://www.sevenforums.com/general-d...tml#post256049
(please also list your motherboard - you can find that easily in cpu-z in mainboard tab)
Also, get CPU-Z CPUID
and GPU-z (if you have a graphics card) GPU-Z Video card GPU Information Utility
See what the temps are that are listed in these programs It might be an issue with the gpu or a fan not being used.
Note: only do a BIOS update if you are familiar with the process. I would say the system might need a BIOS update since this issue is seen after upgrading to a new OS, you might need to update so the new OS can "talk" to your hardware correctly.