Windows 10: why does my CPU always go to 100%

yeah, like very day when my PC is idle for 20 minutes or so - well I start it in the morning and by about 10am its slamming my CPU and always the same... Windows Explore 98% 100% 99% sometimes it lists a sub process called File Explorer even thought I have none open. I've tried to get into the logging tool to log whats going on but it doesn't really seem to give me the granularity I need to get that done. Like the drop down below when I fill this out don't even give an good way to categorize this .. It happens sOO often like every day and I see so many things in the support community about it

:)

 

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.