How to Resolve - CPU usage is stuck at 30 - 50% causing tempature to be 60-75 CPU?

CPU usage is stuck at 30 - 50% causing tempature to be 60-75 CPU

For some reason, my cpu usage gets stuck at around 30-50%, which results to 60-75°C cpu temperature .  I use the computer for really long periods of time, so I
want to minimize the temperature as much as possible to prolong the life of my cpu.
I tried looking into the task manager to find out which program or process is causing that, but there is none.  Even if I total the cpu usage based on the processes in the task manager, it will only sum up to around 10%.

I have MS Security Essentials installed, and I always update it to reduce the risk of getting infection.

In the end, I reboot my computer to reset everything.  But the usage will rise and stay high after an hour or so.  If I remember it correctly, this also happened when I still had my old cpu
and was running on XP.

So my question is:  Is this normal?

Original Title: Windows 7 strangely high cpu usage

Anwsers to the Problem CPU usage is stuck at 30 - 50% causing tempature to be 60-75 CPU

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