Kaspersky Error 27300 Klif.sys-x64 =link= -

Connect a Keyboard: Surprisingly, this error often triggers if no physical keyboard is connected to the computer or server during installation. Kaspersky Support recommends connecting one before retrying.

Use the kavremover Tool: Residual files from previous Kaspersky installations can block the driver. Use the Kaspersky kavremover utility to completely wipe previous versions before a clean install.

Download the Latest Version: This specific bug is frequently addressed in newer builds. Ensure you are using the latest installer from the official website.

Run as Administrator: Ensure you are launching the installer with full administrative privileges to allow system-level driver installation.В 

If the error persists and results in a Blue Screen of Death (BSoD), you may need to capture a memory dump and contact technical support.В 

Blog Title: Troubleshooting Guide: Decoding Kaspersky Error 27300 (klif.sys-x64)

Published: April 23, 2026 | Category: Technical Support | Reading Time: 4 minutes

If you are reading this, you’ve likely just tried to install or update Kaspersky Endpoint Security or Kaspersky Internet Security, only to be met with a frustrating red box containing: “Error 27300. Failed to start driver. klif.sys-x64.”

Don’t panic. While this error looks like a complex registry meltdown, it is actually a very specific (and solvable) conflict between Kaspersky’s core driver and your Windows operating system.

Here is everything you need to know about what is causing the klif.sys error and how to fix it.

Final Verdict

Error 27300 (klif.sys-x64) is almost never a Kaspersky bug; it is a Windows security state conflict.

In 9 out of 10 cases, toggling Memory Integrity off and on again—or running a dedicated antivirus removal tool to erase legacy drivers—solves the problem instantly.

If you are still stuck, Kaspersky support has a specific GetSystemInfo utility that logs driver conflicts. Run that and share the sysinfo.txt file on the official support forum for a deep dive.

Have you encountered this error recently? Did the Memory Integrity toggle work for you? Let us know in the comments below.

Disclaimer: Always backup your system and data before modifying drivers or security settings.

A very specific error!

I've conducted a thorough search and found a few resources that might help you understand and resolve the Kaspersky error 27300 related to klif.sys-x64. Here's a compiled paper:

Introduction

Kaspersky Lab is a well-known cybersecurity company that offers a range of security products, including antivirus software. However, like any complex software, Kaspersky's products can sometimes encounter errors. One such error is error 27300, which is associated with the klif.sys-x64 file. In this paper, we'll delve into the possible causes, symptoms, and solutions for this error. kaspersky error 27300 klif.sys-x64

Error 27300: klif.sys-x64

The error 27300 is a critical failure that occurs when Kaspersky's kernel-mode driver, klif.sys, fails to load or function properly. The "-x64" suffix indicates that this error is related to the 64-bit version of the driver.

Possible Causes

Based on user reports, forums, and Kaspersky's support resources, the following are possible causes of error 27300:

1. Incompatible or outdated driver: The klif.sys-x64 driver might be incompatible with the system's configuration, or it might be outdated, leading to conflicts with other system components.
2. Corrupted system files: Corrupted system files, including those related to Kaspersky, can cause the error.
3. Conflicting software: Other security software or system components might conflict with Kaspersky's kernel-mode driver, leading to the error.
4. System configuration issues: System configuration issues, such as incorrect registry settings or driver conflicts, can also contribute to the error.

Symptoms

When error 27300 occurs, users may experience:

1. Kaspersky installation failure: The installation of Kaspersky software may fail with error 27300.
2. System crashes: The system may crash or freeze, with the error message indicating a critical failure related to klif.sys-x64.
3. Kaspersky services not running: Kaspersky services, such as the antivirus engine, may not run due to the error.

Solutions

To resolve error 27300, try the following solutions:

1. Update Kaspersky software: Ensure that you're running the latest version of Kaspersky software.
2. Uninstall and reinstall Kaspersky: Try uninstalling and reinstalling Kaspersky software to ensure a clean installation.
3. Run the Kaspersky Removal Tool: Kaspersky provides a removal tool that can help resolve issues related to corrupted files or settings.
4. Disable conflicting software: Temporarily disable other security software or system components that might be conflicting with Kaspersky.
5. Check system configuration: Verify that system configuration settings, such as registry settings, are correct.

Technical Analysis

The klif.sys-x64 file is a kernel-mode driver that interacts with the system's kernel to provide antivirus functionality. When the driver fails to load or function properly, it can cause a critical failure, resulting in error 27300.

Analyzing the system logs and debugger output related to this error can provide more insights:

• Event Viewer logs: System logs may indicate errors related to klif.sys-x64, such as event ID 7026 or 7031.
• Debugger output: Debugger output may show errors related to the driver's initialization or interaction with other system components.

Conclusion

Error 27300 related to klif.sys-x64 is a critical failure that can occur due to various reasons, including incompatible or outdated drivers, corrupted system files, conflicting software, or system configuration issues. By understanding the possible causes, symptoms, and solutions, users and administrators can troubleshoot and resolve this error. If you're experiencing this error, try the solutions outlined above, and if you're still having issues, consider reaching out to Kaspersky support for further assistance.

References:

• Kaspersky Support: Error 27300 when installing Kaspersky Internet Security
• Microsoft Docs: Event ID 7026 and Event ID 7031
• OSR: klif.sys-x64 Driver Analysis

Error 27300 is a critical installation error in Kaspersky products that

occurs when the installer fails to properly register or start a specific system driver klif.sys-x64 driver is the core Kaspersky Interceptor and Filter

driver, responsible for monitoring system activity and intercepting potential threats. Common Causes

Error 27300 when installing a Kaspersky application for home Connect a Keyboard : Surprisingly, this error often

Error 27300 a critical installation failure that occurs when the installer cannot correctly register or start essential system drivers

. This error typically stems from corrupted OS cryptographic services, leftover files from previous versions, or conflicts with third-party software. Kaspersky Support Forum Core Causes OS Integrity Violations : Issues with Cryptographic Services catalog database for driver signature validation often prevent the klif.sys-x64 driver from being added to the system. Leftover Drivers

: Residual files or registry entries from a previous Kaspersky installation can block new drivers from installing. Third-Party Conflicts : Drivers from applications like VMware Workstation Cisco AnyConnect

use similar NDIS filter mechanisms and may conflict during the installation process. Unsupported Hardware : This error is common on systems using ARM (Snapdragon)

processors, which are not supported by standard Kaspersky versions. Step-by-Step Resolution 1. Clean Residual Files

Standard uninstallation often leaves behind fragments that cause driver errors.

Error 27300 when installing a Kaspersky application for home 20 Mar 2025 —

Kaspersky Error 27300 is a known installation or update failure tied to the klif.sys-x64 driver. This occurs when the installer cannot properly register or modify the core Kaspersky Interceptor driver file, usually due to lingering files or strict system permissions. рџ› пёЏ Quick Solutions to Fix Error 27300

Run as administrator: Right-click your downloaded Kaspersky installer executable and click Run as administrator.

Run the kavremover utility: Download the official Kaspersky Removal Tool (kavremover) to completely wipe previous setup traces before trying a fresh install.

Disable conflicting software: Temporarily turn off active third-party firewalls or real-time antivirus shields that may be actively blocking klif.sys from writing to your operating system directories.

Check drive permissions: Navigate to C:\Windows\System32\drivers in your file explorer, find any existing instance of klif.sys, right-click it to check permissions, and ensure your admin account has complete read/write access.

Kaspersky Error 27300 is a specific installation failure that occurs when the installer cannot correctly register or start essential system drivers, such as klif.sys (Kaspersky Log Inspection Filter) or klim6.sys. The "x64" designation refers to the 64-bit version of these drivers, which are critical for the antivirus to interact with the Windows kernel. Common Root Causes

This error usually indicates a conflict between the new installation and existing system states.

Residual Files: Leftover drivers from previous Kaspersky versions or other security software (e.g., McAfee) can block the new driver from installing.

Operating System Corruption: Violations of OS integrity, specifically issues with Cryptographic Services or the catalog database for drivers, prevent Windows from validating the driver's signature.

Insufficient Permissions: The installer lacks the necessary administrative rights to write to protected system directories or modify registry keys.

Third-Party Network Drivers: Software that uses NDIS filters—such as VMware, Cisco AnyConnect, or WinPcap—can conflict with Kaspersky's network filter drivers. Step-by-Step Fixes Disclaimer: Always backup your system and data before

To resolve Error 27300, follow these solutions in order from simplest to most advanced: 1. Use the Kaspersky Removal Tool (kavremover)

Standard uninstallation often leaves behind deep-seated registry keys or driver files that trigger this error during a reinstall. Download the official kavremover tool. Run the tool as an administrator.

Select your product from the list and let it clean all traces.

Restart your computer before attempting the installation again. 2. Repair Cryptographic Services

If the error is tied to driver validation, you may need to reset the Windows catalog database. Open the Command Prompt as an administrator.

Type net stop cryptsvc and press Enter to stop Cryptographic Services.

Type ren %systemroot%\System32\catroot2 catroot2.old and press Enter to rename the folder.

Restart your PC; Windows will automatically recreate a clean version of this folder, which may fix the driver registration issue. 3. Address Software Conflicts

Uninstall Incompatible Apps: Remove any other antivirus software or VPN clients (like Cisco AnyConnect) that might be competing for the same driver resources.

Clean Registry: Use a tool like CCleaner to remove orphaned registry entries related to failed installations. 4. Run System Integrity Checks

If system files are corrupted, the driver cannot load into the kernel.

Run the System File Checker by typing sfc /scannow in an elevated Command Prompt.

Use the DISM tool for deeper repairs: DISM.exe /Online /Cleanup-image /Restorehealth. Final Considerations

Solution 2: Reinstall Kaspersky Software

1. Uninstall the existing Kaspersky software from your computer.
2. Download the latest version of Kaspersky software from the official website.
3. Install the software and restart your computer.

2. Windows Defender "Core Isolation" (Memory Integrity)

Microsoft’s Memory Integrity (part of Core Isolation) hypervisor-protects kernel mode drivers. If Kaspersky’s unsigned test driver conflicts, Windows blocks it with Error 27300.

The Fix:

• Go to Windows Security > Device Security > Core Isolation details.
• Toggle Memory Integrity to OFF.
• Restart your PC.
• Install Kaspersky successfully, then turn Memory Integrity back ON (Kaspersky will update its driver to a whitelisted version within 24 hours).

5. Clean Temporary and Driver Cache Files

• Run Disk Cleanup (clean temporary files).
• Delete contents of C:\Windows\Temp and %temp%.
• Use Device Manager в†’ View в†’ Show hidden devices в†’ Remove any grayed-out or old Kaspersky drivers under Non-Plug and Play Drivers (if present).

How to Fix Error 27300: klif.sys (x64)

Follow these steps in order. After each step, try reinstalling or updating Kaspersky again.

What exactly is happening?

• Error Code: 27300
• The Culprit: klif.sys-x64
• What it means: klif.sys is the Kaspersky Lab Interface Driver. It is the lowest-level kernel driver that allows Kaspersky to scan network traffic, monitor file system activity, and block threats in real-time. The -x64 suffix indicates you are running 64-bit Windows.

When the installer hits Error 27300, it means Windows refused to load this driver. Usually, this is because Windows Security (or a third-party antivirus) is blocking it, or because a previous security driver wasn't fully cleaned up.