CPU usage still spikes after virus scan

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I've searched around, couldn't find anything that helped. Recently my PC has been having huge CPU spikes while playing games and such. I've ran virus/spyware scanners and some things were found and taken care of, but none of it helped. Thanks in advance.
 
This usually happens if the game is CPU excessive and it isn't optimised for multi threading.

EIther this or you're running background apps that impact your computer performance.
 
I didn't notice before but I was watching my processes with the task manager and it even spikes while nothing is running. Right after a reboot with nothing open and everything loaded up.

-edit- Thanks for the replies.
 
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