Windows 10: So my CPU is always on 100%

I was hacked but I have cleared everything up and reset the PC so now everything is new and when I open my task manager the CPU is always at 100% even though I only have 100 processes running. My CPU is one of the latest CPUs from AMD. So when I started my PC a message came up which I saw for the first time the message said "your CPU is overwhelming" What should I do :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 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.

 

[FS][US] CPU, NForce4 skt 754 motherboard (with PCI-express slot, rare!), DDR RAM

bump, CPU's stepping is now listed.