Kaspersky related to klif.sys usually happens when the installer fails to load or update the "Kaspersky Log-In Filter" driver. This often occurs because of leftovers from a previous installation or a conflict with existing hardware drivers. Quick Fixes
Standard uninstalls often leave drivers behind. Kaspersky provides a dedicated tool. kaspersky error 27300 klif.sys-x64
: Right-click your downloaded Kaspersky installer executable and click Run as administrator . Error 27300 Kaspersky related to klif
Kaspersky Error 27300 typically occurs during the installation or upgrade of Kaspersky products when the system fails to install the driver (Kaspersky Log Inspection Filter) Kaspersky provides a dedicated tool
Other security software (Antivirus, Firewall, or Anti-Exploit tools) or "driver booster" utilities may lock system resources required to inject the klif driver into the file system stack.
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.