Idle Cpu Temp Higher Since Upgrade

[ICEx21]

As per the title I've just upgraded to Windows 10 and I've noticed the idle temp is now 45c/48c at idle which I find weird as before it was 35c at idle.
I've also noticed using Core Temp that the frequency constantly jumps from 3999.45Mhz to 4399.39Mhz.
Has anyone experienced this issue at all or able to shed any light on this?

 

[ICEx21]

Which programme was it for you?

 

[ICEx21]

I discovered on mine it was Windows Firewall Controller, as soon as I disabled that the temperature dropped 10c, is there any kind of work around for this?