Avast use 15% of my CPU

Hello,

I am trying to solve a problem that was about 1 month or more, I just found that Avast use 15% of my CPU, finally reinstalled the software and still not changed

I keep PC idel for 1-2 hours some times " not continues "

Windows 10 Pro updated

i am asking here before i am going to reinstall the windows as i did not do that for more that 5 years a go, also this windows upgraded from windows 8.1

any one face this problem?

thanks for trying to help me

https://forum.avast.com/index.php?topic=218050.msg1456645#msg1456645