If a previous version of Kaspersky or a different antivirus solution was uninstalled incorrectly, "ghost" drivers or registry keys may still exist. Windows prevents the installation of a new driver if a conflicting filter driver is still registered in the stack.
Ensure you're running the latest version of Kaspersky antivirus. Sometimes, updating the software can resolve issues with outdated drivers.
Kaspersky error 27300 with klif.sys-x64 is a driver-level installation or removal error that halts antivirus functionality. It almost always stems from leftover security software, permission issues, or corrupted driver registries.
The fastest and most effective solution is kavremover in Safe Mode, followed by manual driver cleanup and disabling conflicting services. In persistent cases, repairing the Windows Installer or performing an in-place upgrade eliminates the error entirely.
If you have tried all nine methods and still face the issue, contact Kaspersky Technical Support and provide the log files located at %temp%\kis_install.log or %programdata%\Kaspersky Lab\*.log. They can supply specialized .reg fix scripts or debug builds of the driver.
Disclaimer: Modifying system drivers and registry entries carries risk. Always back up important data before proceeding. This guide is for informational purposes only. Follow steps at your own risk.
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The most reliable first step is using Kaspersky’s own kavremover tool. It forcibly cleans all remnants of Kaspersky drivers, including klif.sys.
Steps:
Why this works: kavremover deletes
klif.sysand its registry entries even if Windows denies access during normal uninstallation.
klif.sys is a critical kernel-mode driver used by all modern Kaspersky products. The -x64 suffix indicates it is the 64-bit version designed for Windows 64-bit operating systems.
Functions of klif.sys include:
Because this driver runs at the deepest level of Windows (Ring 0), Windows protects it rigorously. Any conflict with other security software, corrupted driver registries, or insufficient permissions can trigger error 27300.
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: