Kaspersky Error 27300 Klif.sys-x64 ((new)) <QUICK>

A very specific error!

Error 27300 when installing a Kaspersky application for home 20 Mar 2025 — kaspersky error 27300 klif.sys-x64

sfc /scannow
If SFC reports issues it cannot fix, run: DISM /Online /Cleanup-Image /RestoreHealth
Reboot and re-run sfc /scannow until clean.

Important preparatory steps (do these first) A very specific error

Symptoms of Kaspersky Error 27300: KLIF.SYS-X64 sfc /scannow If SFC reports issues it cannot

Summary

This error is a fascinating example of "security vs. security." Windows is trying to secure the kernel using Core Isolation, and Kaspersky is trying to secure the kernel using its own driver (klif.sys). Error 27300 is the system flagging a "double-booking" of the security layer.

Remove Old Remnants: Use the Kavremover tool from Kaspersky Support to completely wipe previous installation files that might be blocking the new driver.

Error 27300 when installing a Kaspersky application for home

If file is corrupted, replace by reinstalling Kaspersky or restoring from a clean installer.