How to Fix ntoskrnl.exe Causing High CPU or BSOD in Windows
Just take it step by step.
Ntoskrnl.exe is a Windows system process that controls essential functions like memory management and hardware abstraction. If it’s causing high CPU usage or a blue screen of death (BSOD), fixes can include checking your PC’s memory, disks, updates, and system files.
What Is a System Process?
When you boot up a Windows PC or laptop, several system processes kick into action. They generate the user interface you use to sign in and begin working but are also responsible for various under-the-hood actions that you won’t even be aware of—like managing memory and communicating with other network devices.
Unfortunately, system processes like ntoskrnl.exe andcsrss.execan sometimes cause problems on your PC. Ntoskrnl.exe, in particular, is a major component of the Windows operating system. This can make it tricky to troubleshoot issues because it needs to load for you to be able to use Windows.
What Does ntoskrnl.exe Do?
The ntoskrnl.exe system process is formally named the Windows NT operating system kernel executable (and referred to simply as System in the Windows Task Manager). It is arguably one of the most important processes that Windows has.
Ntoskrnl.exe is responsible for providing software access to attached components and peripherals, managing loaded software processes to ensure they interact with hardware correctly (and securely), and controlling how much memory is used (and remains available) on your PC, among other things.
A kernel is code that provides the link between hardware and software. When an operating system like Windows loads, the Windows kernel (ntoskrnl.exe) sends instructions to components like your CPU to perform tasks and actions. Without the ntoskrnl.exe system process, your Windows PC just wouldn’t work.
While you can disable other system components, you can’t disable ntosknrl.exe in a Windows installation. If it is ever forced to stop, Windows will return an ntoskrnl.exe BSOD error, and you’ll need to restart your PC.
Why Does ntoskrnl.exe Cause Blue Screen (BSOD) Errors?
Now that you know stopping the ntoskrnl.exe process results in a BSOD, it shouldn’t surprise you that BSOD errors related to ntoskrnl.exe are related to the process stopping unexpectedly.
There are several reasons why this might happen, though:
We’ll look at how to address these problems after discussing related high-CPU usage issues since the fixes are pretty much the same for both situations.
Why Does ntoskrnl.exe Cause High CPU Issues?
Unfortunately, there isn’t a clear answer as to why ntoskrnl.exe can cause high CPU usage in Windows Task Manager. The causes behind this issue can differ from PC to PC.
This is because ntoskrnl.exe is responsible for many Windows system actions or has a part in making other system actions happen via other processes. For example, the problem could be caused by the following:
As ntoskrnl.exe is partly responsible for memory management in Windows 10, you may find that another app or service interfacing with it is using more system resources, which is incorrectly reported as belonging to the ntoskrnl.exe process.
How to Fix ntoskrnl.exe BSOD or CPU Issues
The best way to resolve these issues is by checking your Windows system files, checking your disks and memory,scanning for malware or viruses, and updating your PC. You can also run Windows in “clean boot” mode to see if another app or installed service is causing the issue.
Windows comes with a built-in tool for diagnosing memory problems.
Note:If Windows doesn’t pop up a report on the scan after the restart, you might need to dig into Event Viewer to find it. Check out our full article onusing the Windows Memory Diagnostic Toolfor instructions.
If the scan does reveal memory problems, you’ll probably need to replace the memory on your PC.
Windows works well when all of its required system files are in place. If some of those files are corrupted, missing, or can’t be accessed, then your Windows 10 installation may start to become unstable, with ntoskrnl.exe BSODs and errors becoming more likely.
One possible way to fix this is by running thechkdskandsfccommand-line tools using Windows PowerShell.
These tools will check your installation and hard drive for missing or corrupt files. If ntoskrnl.exe issues continue, you’ll need to try one of the additional steps listed below.
Windows system updates come with fixes and upgrades that can help resolve more common issues that users report online, including BSOD errors and high CPU usage.
Making sure your PC is up-to-date by installing any available system and driver updates can sometimes resolve these issues.
If you’ve recently installed a new PC component or peripheral, you might want to check the manufacturer’s website for driver updates. This is particularly true for graphics cards, asmanufacturers like NVIDIAregularly release brand-new drivers before they’re added to Windows Update.
Thanks toMicrosoft Defender(previously Windows Defender), it’s never been easier toremove stubborn malwarefrom a Windows 10 PC.
If Defender detects any malware, you’ll be asked whether you want to remove or quarantine it.
If you’re experiencing a BSOD error, this built-in Windows troubleshooter might help.
Windows isn’t free from errors or bugs, but if your PC is up-to-date, and your system files are intact, then another app or installed service could be behind any potential ntoskrnl.exe issues.
To check this, you canrun a clean boot, which will run Windows without third-party apps and services.
If that’s the case, you’ll need to investigate each service in turn to determine which may be causing high CPU usage. You can then disable any problematic apps or services permanently if you find a culprit.
Resolving Ntoskrnl.exe Issues
If the methods above don’t work, you might need to take more drastic action likewiping and reinstalling Windows. And if that still doesn’t resolve the problem, then you likely have a hardware problem that memory diagnostics and disk scans didn’t pick up.
Ben Stockton is a freelance technology writer based in the United Kingdom. In a past life, Ben was a college lecturer in the UK, training teens and adults. Since leaving the classroom, Ben has taken his teaching experience and applied it to writing tech how-to guides and tutorials, specialising in Linux, Windows, and Android. He has a degree in History and a postgraduate qualification in Computing.Read Ben’s Full Bio
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