Kaspersky Error 27300 Klif.sys-x64 May 2026

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

Memory Integrity

This can happen if you have hardware-enforced driver blocking (e.g., HVCI – Hypervisor-protected Code Integrity). Disable under Windows Security → Device Security → Core Isolation. kaspersky error 27300 klif.sys-x64

1. Leftover files from a previous antivirus – Residual drivers from another AV (e.g., Norton, McAfee, Avast) conflict with klif.sys.
2. Corrupted Kaspersky installation – Incomplete or damaged previous install.
3. Windows Driver Signature Enforcement – Kaspersky drivers are signed, but strict policies or corrupted signature caches can block loading.
4. Interference from another security product – Running two real-time antivirus tools simultaneously.
5. Windows System File Corruption – Missing or damaged system files that klif.sys depends on.
6. Insufficient permissions – The installer lacks admin rights to install the driver.

1. Download the official Kaspersky Removal Tool (kavremover).
2. Run it to strip all traces of previous Kaspersky installations.
3. Reinstall the software.