Question CPU 100% usage, untill task manager opened

Mar 22, 2019
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I installed a game, that i played before, ( Kingdom Come : Deliverance) and i noticed that i dont have the fps that i had before, from 50-60 i had 15-30, if i used alt+enter to switch between borderless and fullscreen, then, i had my usual fps. How do i make that 100% cpu go away, i guess that is the problem.

Also, when i played the game before, i didn't had an ssd, now i do.

My laptop specs are:

GTX 950M

I7-4720HQ 2.6-3.6ghz

8GB DDR3 Ram

1TB Hdd

and 250 GB ssd samsung 860 m.2

The process which consumes the 100% CPU is called system interrupts
I only tried a few things to fix it: Drivers update
FULL Virus scans with Avast, AVG and Kaspersky antiviruses
I also played with the page file
And in each of these i restarted the laptop.
Thanks for your patience of reading this !