ntoskrnl.exe causing high cpu usage.

Hi Pato32423 -

I'm Kevin B. Independent advisor and a Windows user like you. I do apologize for the inconvenience that you experiencing right now, let me help you sort things out.

NTOSKRNL.exe or Windows NT operating system kernel is a Microsoft system application which is responsible for various system services such as hardware virtualization, process and memory management, thus making it a fundamental part of the system.

Please follow the steps below and check if this resolves the issue.

Run a system file checker to verify the integrity of windows system files on your computer making sure that there are no corrupted files on your windows.

Perform SFC Scan and Repair Windows Image
-This process will perform scan for any corrupted system files or integrity violation and will attempt to repair it along with the Windows Image.

1. Open command prompt with administrator access
2. Type each command below and wait until scan is completed.

SFC /scannow
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

Quick note: While the command is running, it's expected to see the process stuck at 20 or 40 percent. After a few minutes, the process will complete successfully.

Once you complete the steps, the Deployment Image Servicing and Management tool will connect to the Windows Update servers to download and replace any damaged files in the local image for Windows 10 as necessary.

3. Close the command prompt.

After the scan, please perform cleanboot

Perform Clean Boot
- This process will eliminate 3rd party application running in the background of your computer along with services that are not needed to run windows. If there's any conflicting 3rd party application that causes the issue on your computer, this process will stop it.

1. Open the run box by pressing the Windows Key + R and type msconfig
2. System Configuration Utility box will open and by default you are on general tab.
3. On the General tab, click the selective startup and make sure that load system service and load startup items both have checked mark.
4. Click on services tab
5. Put a check mark on Hide All Microsoft Services > This is a very important part as if you miss to click on this, computer might not boot properly or permanently and will end up on clean installation.
6. Once Hide all Microsoft Services have checked mark on it, click on Disable All
7. Click on the Startup Tab and click open task manager. This will open another window which contains all your startup applications on the administrator account.
8. Disable all application that you're not using. You can simply just click on them and select disable.
9. Click OK , Apply and close the configuration utility

Restart the computer and try to check if the same issue persist

Hope this will help and have a bless day!

Thanks.
Kevin B.
Independent advisor