Windows 10: Task Manager showing higher CPU than sum of all processes- malware?

My computer’s task manager has always shown a higher cpu than the sum of all the processes being used. It’s been like this for a long time and I thought it was normal, but after norton blocked a coinminer from a website that used adobe flash I began to think that I have hidden malware installed on my computer. After norton detected the attack I did a full system scan using Malwarebytes Free and nothing came up, which is really making me worried because I have no way to check if I have malware installed or not. Are there any other methods of checking to see if I have something malicious? I’m scared to restart my computer because I know malware can screw things up upon restarts.

:)

 

Task manager total cpu incorrectly shows a high value

I've just upgraded to the newly released Windows 10 Home 1809 and notice in task manager that the total at the top of the CPU column is always
much higher than the actual sum of the detail.

For example, at the moment total CPU is over 60% but there is just one task with usage (slightly) over 2% and all the rest below 1%.

Any ideas?

 

Task Manager shows CPU speed that is higher than its maximum

Here's the
link to Vidyaranjan A V answer, to know more about overclocking.

Thank you.

 

CPU Constantly at 100% In Task Manager, But Not in Process Explorer

Starting yesterday, I have a very odd problem on my Windows 10 desktop-- my CPU is constantly running at 100% (according to Task Manager), and it isn't throttling down. Because of this, it's constantly running at 3.3 GHz and the temperatures are rising to the point where the fans kick in at full force. If I go into the Windows power settings screen and manually change the processor power maximum to 50%, then it's capped at 50% frequency (~1.5 GHz), but it never goes below the maximum possible frequency.

The weird thing is, when I look at the process list, there isn't really anything obvious that's triggering it. None of the processes are abnormal, and though the process CPU percentages do add up to 100%, it doesn't make sense to me that each individual process is taking up as much CPU as Task Manager says it is. Everything seems to be "using" a significantly higher amount of CPU resources than it normally does.

As an attempt to diagnose the problem, I've also tried using Process Explorer. The really weird thing is that Process Explorer shows only 1-2% usage when idle, with the System Idle Process taking up the remaining ~98% as I would expect. Again, nothing looks out of the ordinary in the process list, but the processes are showing the levels of activity I would expect in Process Explorer.

I've already run both Windows Defender and Malware Bytes (a virus was my first guess), but nothing has turned up yet.

This same issue also occurs in Safe Mode, so I'm guessing that it's more along the lines of something to do with Windows itself...

So, to recap:

• Windows 10 Desktop
  
• Intel 970, 3.3 GHz, 6 cores
  
• Task manager and resource monitor graphs shows 100% usage total
  
• No individual process is taking up significant resources in the resource monitor list
  
• CPU is not throttling down automatically based on the dynamic load, causing high temperatures and the fan to kick in
  
• Process Explorer is only showing 1-2% CPU usage
  

Before I go uninstalling everything, how would I figure out what's causing the issue if nothing weird is showing up in Task Manager or Process Explorer?