Windows 10 CPU Usage at 99%. Processes not showing correct CPU usage

Question

On a Windows 10 16299.192 desktop system task manager always shows 99% usage. If I try killing the highest usage program all others suddenly show their CPU usage increasing to fill the gap, as if the CPU usage is being calculated as % of CPU cycles currently used instead of % CPU cycles available like normal.

I tried editing a registry key to allow me to disable the processor idle state (as has worked in the past) but no change even after a reboot.

Process Explorer does show the correct CPU usage numbers, with System Idle Process filling in the remainder of (100% - Current Usage) like normal.

Intel i3-4170 CPU. Let me know if there's any more information you might need.

Answer 1

Found this link after more digging with PowerCfg commands that finally did the trick. CPU Constantly at 100% In Task Manager, But Not in Process Explorer