How to fix Event ID 55 (Kernel-Processor-Power) in Windows?

What causes How to fix Event ID 55 (Kernel-Processor-Power) in Windows?

Hardware issues
Driver issues
Problems with power settings
Processor overheating
Low power from motherboard or power supply

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Hello. I have been playing Halo and I noticed that the game started stuttering and lagging. I checked the Event Viewer and found an Event ID 55 (Kernel-Processor-Power) error. The issue does not seem to go away. How do I fix this?

Event ID 55 is an error message that may appear in the System log in Windows Event Viewer. It indicates that the Kernel-Processor-Power event has occurred. This event is related to the power management of the processor on your computer. The Kernel-Processor-Power event is generated when the system experiences an issue with the power management of the processor.

This could be caused by a variety of factors, including hardware issues, driver issues, or problems with the power settings on your computer. You may want to try troubleshooting the issue by checking for hardware issues, updating your drivers,[ref en-1] or adjusting your power settings.

If you are unable to resolve the issue on your own, there is a possibility that there is an error with the processor itself. This might happen when the processor is overheating or getting low power from the motherboard or in the power supply. In that case, you may want to consider contacting a technical support representative or a computer repair professional for further assistance.

In this guide, you will find 5 steps that should help you fix Event ID 55 (Kernel-Processor-Power) in Windows. However, if they do not help, you can also try running a maintenance tool like [d1]. It can fix most system errors, BSODs,[ref en-2] corrupted files, and registry[ref en-3] issues. Otherwise, you should check your system for hardware failures.

How to fix event id 55 kernel processor power in windows

Method 1. Fix Corrupted System Files

Use Command Prompt commands to repair system file corruption:

Open Command Prompt as administrator
Use the following command and press Enter:
sfc /scannow

Reboot your system
If SFC returned an error, then use the following command lines, pressing Enter after each:
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

Method 2. Run Memory Diagnostic Tool

Press the Windows key + R on your keyboard to open the Run box
Type mdsched.exe and press Enter
Click Restart now and check for problems (recommended)

Follow the on-screen instructions

Method 3. Update Drivers

Outdated drivers could be the cause of the error. In this case, you can fix it automatically by using [rev id="DriverFix"], which will scan your PC for missing and out-of-date device drivers. Or you can update them manually:

Open Settings
Click on Update & Security
Click on Windows Update
Click the Check for updates button
Click the View optional updates option
Click the Driver updates tab
Select the driver you want to update
Click the Download and install button

If the View optional updates link is not available after checking for updates, then Windows Update does not have any new drivers or any updates for other products at that particular time.

Method 4. Perform Clean Boot

Type MSConfig in the Start Menu and hit Enter to open the System Configuration Utility
Click on the General tab, and then click Selective Startup
Clear the Load Startup Items checkbox, and ensure that Load System Services and Use Original boot configuration are checked
Next, go to the Services tab

Select the Hide All Microsoft Services checkbox
Now click Disable all
Click Apply and OK and restart the computer

Method 5. Repair Install Windows

Visit the official Microsoft website to download Windows 11 or Windows 10 Installation Media
Run the Media Creation Tool and select Create Installation Media for another PC
Select your USB drive
Let the Process complete of writing the Installation files to the USB drive
Click Finish

On the PC you wish to upgrade, Press Windows + E to open the File Explorer
Open the Removable drive and click Setup.exe
Accept the license terms on the next screen
Confirm the Upgrade options – Files, apps and Settings are kept
Click Install, and the upgrade should start

Bottom line

To fix Event ID 55 (Kernel-Processor-Power), you can repair corrupted system files using Command Prompt, run the Memory Diagnostic Tool, update your drivers, or adjust your power settings. If these steps do not resolve the issue, consider contacting technical support or a computer repair professional.

Frequently asked questions

What does Event ID 55 (Kernel-Processor-Power) indicate in Windows 10 or Windows 11?

Event ID 55 indicates that there is a power management issue related to the processor, which may lead to system instability or performance problems in Windows.

How can I troubleshoot Event ID 55 in Windows 11?

To troubleshoot Event ID 55 in Windows 11, ensure that your system drivers are up-to-date and check your power settings to optimize performance.

Are there any specific power settings adjustments to fix Event ID 55 in Windows 10?

Yes, you can adjust your power plan settings to 'High Performance' and disable any power-saving features that may affect processor performance to help resolve Event ID 55.

Did this fix work for you?

Written & verified by

Sarah Chen

Cybersecurity Analyst

Cybersecurity Threat detection Security hardening Data protection Vulnerability assessment

Sarah Chen is a cybersecurity analyst focused on protecting Windows systems from emerging threats and preventing data breaches. She covers security hardening, vulnerability assessments, and post-infection cleanup for home and small business users. Sarah translates complex security concepts into practical hardening steps — firewall configuration, exploit mitigations, secure boot settings, and defence-in-depth practices that meaningfully reduce attack surface. She stays current with the threat landscape and contributes security advisories to the uGetFix news section when new vulnerabilities affect Windows users.

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