avpui.exe Unknown Hard Error when shutting down

Published by Nyau Wai Hoe - Updated on

Some Windows 11 and Windows 10 users may experience an issue where an error message labeled “avpui.exe – Unknown Hard Error” appears during the reboot or shutdown process. This error can be confusing and slightly alarming, especially since it typically occurs at a critical moment when shutting down the computer.

The primary symptom of this issue is a delay in the shutdown process; the system does not immediately shut down but instead takes about an additional half a minute to complete the process. Despite this inconvenience, the computer eventually shuts down, but the persistent error message can be a source of concern for users who are unsure of what it actually means and how to address it.

avpui.exe Unknown Hard Error when shutting down

What actually is avpui.exe?

The file “avpui.exe” is an integral part of the Kaspersky antivirus software suite, specifically related to its user interface. This executable file is responsible for displaying the graphical elements of the antivirus program, such as notifications, settings menus, and security alerts. It acts as a bridge between the user and the core functionalities of the antivirus, ensuring that users can interact with the software effectively. Typically, avpui.exe runs in the background and is only noticeable when you interact with Kaspersky’s interface or when an issue arises, such as the “Unknown Hard Error” during shutdown.

What is avpui.exe Kaspersky Antivirus

Given its role in system security, avpui.exe is a legitimate and important component of the Kaspersky antivirus system. It’s not inherently harmful or indicative of a virus or malware. However, like any software component, it can encounter issues due to various reasons, which might lead to the error observed during shutdowns.

Linked issue: Closing 1 App and Shutting Down in Windows 11/10 (Fix)

Why does avpui.exe cause an unknown hard error during shutdown?

The “Unknown Hard Error” associated with avpui.exe during shutdown can be attributed to several potential causes. This error typically indicates a problem with the executable file or its interaction with the operating system, but the exact cause isn’t always clear, hence the term “unknown.” Here are some common reasons why this error might occur:

Software conflicts

If there are other programs or processes that conflict with avpui.exe, this can lead to errors. These conflicts often arise during system shutdown when multiple processes are trying to close simultaneously.

Also see: Sihost.exe, Ctfmon.exe or Explorer.exe Unknown Hard Error

Corrupted files

The avpui.exe file itself or related system files may become corrupted due to various reasons like improper software updates, system crashes, or malware.

Outdated software

Running an outdated version of Kaspersky antivirus or an outdated operating system can lead to compatibility issues, which might manifest as errors during shutdown.

System issues

Sometimes, the error can be a symptom of broader system issues, such as corrupted Windows system files or registry problems.

The “Unknown Hard Error” is essentially a catch-all term used by Windows to signal an unclassified problem with avpui.exe, making pinpointing the exact cause a bit of a challenge. However, understanding these common causes can help in troubleshooting and resolving the issue.

Related resource: What is avp.exe (Kaspersky) & its High CPU and Disk Usage

How to get rid of the “avpui.exe – Unknown Hard Error” pop-up during shutdown

To address the “avpui.exe Unknown Hard Error” on your Windows 10 or Windows 11 computer, consider the following troubleshooting steps.

Update Kaspersky Antivirus and Windows

Keeping your antivirus software and operating system up-to-date is crucial. Updates often resolve known bugs and compatibility issues.

Update avp.exe Kaspersky Antivirus

Reinstall Kaspersky Antivirus

Uninstalling and then reinstalling Kaspersky can fix issues related to corrupted installation files.

Reinstall Kaspersky Free Antivirus

Scan for malware with another tool

Sometimes, malware can cause such errors. Use a reliable malware scanning tool, different from your primary antivirus, to check for and remove any malicious software.

Windows Security Defender Full Scan

Run System File Checker (SFC)

Use this built-in Windows tool to repair potentially corrupted system files. Open Command Prompt as an administrator and type sfc /scannow, then press Enter.

SFC scannow successful repair Windows 11

Check for software conflicts

Inspect your system for other software, especially other antivirus programs, which might conflict with Kaspersky.

Switch to a different antivirus solution

If the problem persists despite these measures, consider switching to a different antivirus solution. This step can help determine if the issue is specifically related to Kaspersky.

Bitdefender antivirus Windows 11

If none of these steps work, it might be beneficial to check the Event Viewer in Windows. For users familiar with this tool, it can provide detailed information about system events and errors, which can help pinpoint the source of the issue.

Should you be concerned about leaving the error unresolved?

When it comes to the “avpui.exe Unknown Hard Error” you encounter during shutdown, you might be weighing whether it’s a cause for concern. If this error is an occasional hiccup and isn’t causing any observable issues besides the slight delay in shutdown, it may be safe to overlook it. Computers, like any complex system, can occasionally throw up minor errors that don’t have a significant impact on their overall functioning.

However, if the error is nagging at you or you’re concerned about the potential implications for your system’s health and security, considering a switch to another antivirus solution could provide an alternative perspective. Sometimes, a change in software can eliminate such errors, offering reassurance that your system’s defenses are fully operational without any hitches.

Ultimately, your response to this error can be guided by the frequency and impact it has on your computer’s performance. A sporadic and non-disruptive error might not warrant immediate action, but if peace of mind is paramount, exploring alternatives is a sensible approach.

Concluding thoughts

In summary, the “avpui.exe Unknown Hard Error” typically arises from software conflicts, outdated antivirus or system software, or occasionally due to corrupted files. However, it’s not a very common issue for users of Kaspersky antivirus on Windows 10 and 11. Most users find success in resolving this error by either reinstalling the antivirus software or switching to a different antivirus solution.

While this error is usually not a major cause for alarm, especially if it’s infrequent and doesn’t noticeably affect system performance, addressing it can help maintain your computer’s health and ensure your antivirus is functioning correctly. In the end, the choice to tackle this error head-on or to let it be depends on its impact on your system and your peace of mind.


Nyau Wai Hoe
Nyau Wai Hoe is the Founder and Chief Editor of WindowsDigitals.com. With a degree in software engineering and over 12 years of experience in the tech support industry, Nyau has established himself as an expert in the field, with a primary focus on the Microsoft Windows operating system. As a tech enthusiast, he loves exploring new technologies and leveraging them to solve real-life problems.

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