Windows 10: How do i fix this problem where my cpu wont go above 25% usage

I have this problem where my cpu wont go above 25% and its lagging its caped at 25% i dont know what to do

:)

 

NT Kernel consistenty taking 25% of CPU Usage

For about 3 weeks I have noticed that the system process in windows 10 is taking 30% of my cpu. I have searched the web and found various ideas for addressing the problem but my techncal skills are a little rusty. I have attached a screenshot from windows performance analyser and wdered if there was anyone who could suggest what I should do next.

Here's hoping.

 

How fix 4-times-higher CPU usage at idle?

Yes, I have noticed negative effects on my PC's performance:

-Browsing is slower when I open multiple tabs rapidly. I do this a lot (I research multiple links in online articles).

-My PC gets much hotter, and stays hot--so much hotter that I have to turn it off.

After the Windows 10 Anniversary Update, the 39% CPU usage screen shot of my Process Manager was when I was doing nothing--no browsing, word processing, etc. Before I took the screen shots, I closed all application programs. My machine was leveled out, as you better describe it (the screen shots were taken 5 minutes after my PC first leveled out). My PC is 39% CPU usage when leveled out; never lower.

Before the Windows 10 Anniversary Update, my PC was 10% CPU usage when it leveled out. And it stayed there.

1 other PC we have with the Windows 10 Anniversary Update (same model as my PC) *HAS* the 39%-CPU-usage-at-idle problem.

2 other PCs we have with the Windows 10 Anniversary Update (different brands) DO *NOT* HAVE the 39%-CPU-usage-at-idle problem. They have only 10% CPU usage at idle.

[NOTE I've no software to my PC after the Anniversary Update. My programs, etc. the are same as before.]

Any ideas on what to do to fix my high CPU usage?:
-use Process Explorer? (how do I use it in this case?)
-reinstall hardware drivers? (which ones?)
-suspend certain services? (which ones?)

I've seen comments suggesting each of the above ideas. I need step-by-step instructions (ideally screen shots) for Process Explorer. For drivers & services, which do I try?

Any ideas on the above possible fixes OR better fixes for my high-CPU-at-idle problem? I'd really appreciate them

 

How fix 4-times-higher CPU usage at idle?

I have tried to summarize my problem.

Is there other information I could provide to get some ideas to help solve my problem?

I've tried 3 of the 4 Methods here, but the post is old, and they didn't work:
Windows 10 High CPU Usage Fixes

Would greatly appreciate any suggestions.