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Download SpeedFan and see if that can get the temps. It would seem normal if hyperthreading made the CPU hotter as it would be under more load. The hard disk temps don't have much to do with it.
The cooling pad will work with a 17" laptop. It fits my 15.4" perfectly, so your 17" will probably just hang off the edge a little, but it should be fine.
The blue screen could be a side effect of the overheating. If your laptop is shutting down without warning, it is doing so because temps have reached a certain point that hardware damage may result if the CPU is allowed to continue operating at those temps. There is a good chance that it is unstable at those temps, and an unstable CPU can do anything, including cause blue screens.
If you post the full error you get on the blue screen, it will help in determining its source, but there is a good chance it is just a result of the overheating. I would wait and see if it goes away when you get the cooling pad before trying to do anything.
There is one thing you can try with SpeedFan. Look at the CPU temps with the power profile "Home/Office Desk" selected, and see how much lower they are with the profile "Notebook/Laptop" selected.
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