Kaspersky Error 27300 Klif.sys-x64 May 2026

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.

Once you have resolved the error, follow these best practices: kaspersky error 27300 klif.sys-x64

If you are a Kaspersky user—whether running Kaspersky Internet Security, Kaspersky Total Security, Kaspersky Endpoint Security, or Kaspersky Free Antivirus—you might have encountered a frustrating roadblock during installation, update, or uninstallation: Kaspersky error 27300. This error is almost always accompanied by the specific driver reference klif.sys-x64. If a previous version of Kaspersky or a

This error can prevent you from installing, removing, or properly running Kaspersky products. It can also trigger system instability, blue screens, or failure of real-time protection. The good news is that this error is well-documented, and solutions exist—from simple driver fixes to advanced system modifications. If you are a Kaspersky user—whether running Kaspersky

In this long-form guide, we will explore what error 27300 means, why the klif.sys-x64 driver is critical, what causes the problem, and how to fix it step-by-step on Windows 10 and Windows 11 (64-bit systems).

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.