Windows 10: My CPU usage goes to 100% until i check it via task manager where it goes back to idle...

My fans will begin to spin up, and if I'm playing a game, i will notice stutters and frames dropping. I then check task manager, for a split second its at 100% usage, the apps that using the most usage, is different. But just now i noticed cortana

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Task manager showing 100% CPU usage at idle.

Task manager is showing 100% CPU usage at idle. If you look into the details to see what if anything is really using that much processing power and it shows "system idle process" at 99-100% when at idle. This is normal I know but task manager should not
be including "system idle process" when its calculating CPU usage. This is causing my CPU to ramp up and my fans to stay at full speed at ALL times.

Things I've tried:

*Re installing windows. (multiple different ways and at different times throughout the diagnosing process)

*Removed all ram and just a single stick (multiple different known good sticks) & and two sticks

*Removed GPU

*Cleared cmos

*Bios Update

*Multiple different bios setting and power settings

*Adjusted all windows power settings plugged in and on battery (tho this is a pc)

I'm at a loss. There is no performance loss but having my CPU automatically overclock and fans at full speed all the time is not going to work.

Oh and on a weird side note, few nights ago was working on fixing this issue like usual and ended up accidently leaving the computer on all night (which I don't do because I don't like leaving the CPU overclocked it see's about 50-60c at idle) when I woke
up and went to turn computer off CPU usage was at 1-4%...!!!! I was shocked and thought that some how it must have updated widows and fixed the issue. But issue came back next re-boot.

SYSTEM SPECS:

Mother Board = z77a-gb65

CPU = i3 3240

RAM = 16g (4x4g 2 corsair 2 pny)

GPU = Gigabyte GTX 970 G1

Thank you to anyone that can help...

 

CPU Usage 100% and idle process is 100%

My CPU usage shows permanently 100% in task manager (in "Processes" tab) even my system idle process (in "Details" tab) is almost 100% and the CPU runs hot - fan is permanently on - CPU speed (in "Performance" tab) is always a bit above maximum speed!!!
McAfee doen't show any virus problem. HP Spectre.

 

CPU at 100% that goes away when opening Task Manager

Thanks for your answer @Jay#222. I understand that a computer is doing a lot in the background. In that case above, I was using Adobe Lightroom which is heavy on the CPU but I might get this when I'm just using Google Chrome googling things. Its weird to
me because upon opening the Task Manager, my CPU calms down when it might have been working hard for quite some time. My CPU might be working hard for 10 minutes and then upon opening Task Manager, it calms down. I'm sure if it listed the CPU usage prior to
opening the Task Manager, it would be 90%-100% usage all prior. Is it something like the Task Manager flushes processes and that's why it drop significantly? And I mean it drops to the point where the fan will calm down and my laptop will not lag much.