Kaspersky antivirus and endpoint security products are known for their robust protection, but like any complex software, they can encounter installation or update errors. One of the more technical-sounding issues users face is Error 27300, specifically referencing the file klif.sys on a 64-bit (x64) Windows system.
This article explains what this error means, why it occurs, and the most effective ways to resolve it.
Error 27300 can also appear if the Windows Management Instrumentation (WMI) database is inconsistent.
The Fix:
winmgmt /verifyrepositorywinmgmt /salvagerepositoryNo. The product is non-functional without klif.sys. It is mandatory for real-time protection.
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.
Kaspersky Error 27300 typically occurs during installation when the system fails to register essential drivers, specifically the klif.sys_x64 file. This error is often triggered by remnants of previous antivirus software, corrupted system files, or conflicts with third-party drivers. 🛠️ Step-by-Step Resolution Guide 1. Remove Leftover Kaspersky Data kaspersky error 27300 klif.sys-x64
Old registry keys or system files from previous installations can block new drivers. Download the official Kavremover utility. Run the tool in Windows Safe Mode for the best results.
Select the specific Kaspersky product you previously had or use the "All known products" option. Restart your computer completely after the tool finishes. 2. Check for Incompatible Software
Third-party applications, especially those that use network filtering or virtual drivers, can conflict with klif.sys. Understanding and Fixing Kaspersky Error 27300: klif
Temporarily uninstall applications like VMware, Cisco AnyConnect, or WinPcap (NPF) if they are present.
Check for and remove other antivirus programs that might still be active or partially uninstalled. 3. Repair Windows System Integrity
Corruption in the operating system's cryptographic services or system files can prevent driver installation. Open Command Prompt as Administrator
Error 27300 when installing a Kaspersky application for home
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.