CPU always at 100%?

[carrickwater]

So this issue has been going on for a few months and I wanted to know exactly what the issue is. Would be grateful for your help.
Almost anything I do, which includes using simple Firefox, my CPU runs at 100%. This has resulted in me not being able to play simple games, not to talk of even cyberpunk. My machine is not that good but even people with a intel 2400 are able to play cyberpunk at meduim settings, so something is definitely wrong with my system. What makes it worse is that I can't even play simple games. These are my PC specs. Please help me troubleshoot this. I'll upgrade my PC but for now my money is tight. Also, I checks temps and the max I saw was 64 when running under load, which I'll say is ok.
 

CPU Brand:  Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz

Speed: 3193 Mhz

Operating System Version: Windows 10 (64 bit)

Video Card: NVIDIA GeForce GTX 1060 3GB

RAM:  16338 Mb DDR3

[carrickwater]

So I installed a new ssd and I’m now getting 40 FPS in cyberpunk at high settings . Crazy. Anyone who knows how I can pinpoint which programs on my pc are making it run slow? I’ll be grateful. Thanks