Windows 10: cpu at 100% while in a scan

I don’t know what to do, i regularly scan my pc using windows defender and now when i do it my cpu goes to 100% and i have been looking everywhere for a fix and i cant find one. Please help

:)

 

100% Cpu

• #1

Cpu: i5-8600

GPU: RX 580 Series

RAM: 16.0 GB

Motherboard: Aorus

Power supply: Corsair Vengeance LPX 16GB DDR4

Resolution: 2560 x 1080

Was working fine not it just crashes my game the game is Tom Clancys Rainbow six siege but I can barely also start up other games

 

CPU at 100% Usage when using Full Scan in Windows Defender

I'm trying to scan for viruses but every time I choose Full Scan or Custom Scan my C: Drive my CPU shoots up to 100% usage and overheats prompting the scan to stop or my PC shuts down. I used Core Temp during a scan and all cores are getting up to 100
degrees Celsius. I've tried excluding Antimalware Service Executable folder from scan but same thing happens.

 

CPU constantly at 100% in task manager

That is exactly what I did previously. I tried setting max to 80% to test and task managers cpu displays constant 80% instead of 100% on the performance tab and 80% above the cpu column in the users tab. Sadly it has no effect but thank you for the suggestion.