Kaspersky Error Installing Driver Klim6sys X64 Upd Jun 2026

One of the most persistent issues users encounter when setting up or updating Kaspersky security software is Error 27300 , often specifically citing a failure to install the klim6.sys_x64 driver. This driver acts as the "Kaspersky Anti-Virus NDIS Filter," an essential component that intercepts network packets to protect your device from online threats. If your installation is repeatedly failing with this error, it is typically due to leftover files from previous versions, conflicting third-party network drivers, or corrupted system registry keys. 1. Perform a Clean Uninstall with Kavremover The most frequent cause is "ghost" drivers from a previous Kaspersky installation that didn't clear out properly. Standard Windows uninstallation often leaves behind registry entries that block new driver updates. Download the official Kaspersky Kavremover tool . Run the utility to strip all traces of previous Kaspersky products. Restart your computer immediately after the process finishes. 2. Manual Removal via Command Prompt If the remover tool doesn't fix the issue, you may need to manually delete the problematic driver service. Search for cmd in your Start menu, right-click it, and select Run as Administrator . Type the following command and press Enter: sc delete klim6 If you receive a success message, try restarting the Kaspersky installer. 3. Check for Conflicting Network Software Because klim6.sys is a network filter driver, it often conflicts with other software that uses similar technology, such as VPNs or virtual machine software. Known Conflicts: Common culprits include VMware Workstation , Cisco AnyConnect, and WinPcap. Solution: Temporarily uninstall these applications, complete the Kaspersky installation, and then reinstall them afterward. This allows the Kaspersky NDIS filter to seat correctly first. 4. Reset the Network Configuration (Windows 7/8/10) If you are on an older version of Windows or have a corrupted network stack, a registry tweak can sometimes bypass the "too many filters" limitation. Open the Registry Editor (type regedit in the Run prompt). Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network . Find the Config parameter and rename it to Config2 . Restart your PC and try the installation again.

Resolved: "Kaspersky Error Installing Driver klim6sys x64 upd" – Complete Fix Guide If you are reading this, chances are you have encountered a frustrating roadblock while installing or updating Kaspersky antivirus on your Windows 64-bit PC. The installation process halts, rolls back, and displays a cryptic message: "Error installing driver klim6sys x64 upd" (or a similar variant mentioning klim6.sys ). This issue is more common than you might think. The klim6.sys file is a critical low-level system driver (part of Kaspersky’s Anti-Virus and Anti-Rootkit protection). Without it, your Kaspersky product will not function correctly, leaving your system vulnerable. In this long-form guide, we will break down exactly what this error means, why it happens, and provide 10 proven solutions —from simple reboots to advanced manual cleanup using Windows Safe Mode.

Part 1: Understanding the Error – What is klim6.sys ? Before diving into fixes, let’s understand the culprit.

File Name: klim6.sys Full Name: Kaspersky Lab Intermediate Minifilter Driver Purpose: This driver acts as a gatekeeper. It intercepts system calls related to file operations, network traffic, and process creation. It allows Kaspersky to scan files in real-time, block malicious scripts, and defend against rootkits. Location (when installed correctly): C:\Windows\System32\drivers\klim6.sys The "x64 upd" part: This indicates the 64-bit version of the driver is failing during the update ( upd ) process. kaspersky error installing driver klim6sys x64 upd

Why does the error occur? The error typically appears for one of the following reasons:

Leftover remnants of old antivirus software (especially McAfee, Norton, AVG, or even an older Kaspersky version). Corrupted Windows Driver Store – Windows blocks the installation because it believes the driver is unsafe or already exists in a damaged state. Pending file rename operations – A previous failed installation left behind a flag in the registry saying, “Wait, delete the old driver first.” Conflicting security policies (e.g., Microsoft Defender’s Core Isolation / Memory Integrity). Insufficient permissions or corrupted user profile .

Part 2: Initial Quick Fixes (Try These First) These steps take less than 5 minutes and resolve the issue in about 30% of cases. Fix 1: The "Full Shutdown" (Not Restart) Windows 10/11’s “Fast Startup” feature can lock system drivers. A simple restart may not clear this lock. Steps: One of the most persistent issues users encounter

Click Start → Power button. Hold down the Shift key on your keyboard. While holding Shift, click Shut down . Wait 30 seconds. Power on your PC normally. Re-run the Kaspersky installer (as Administrator).

Fix 2: Run the Installer as Administrator Right-click the Kaspersky setup file (e.g., setup.exe or kaspersky4.exe ) → Run as administrator . Standard user accounts often lack permission to load kernel-mode drivers. Fix 3: Temporarily Disable Microsoft Defender & SmartScreen Real-time protection from Windows Security can interfere with driver installation.

Open Windows Security → Virus & threat protection . Click Manage settings under “Virus & threat protection settings”. Turn off Real-time protection . Also disable Tamper Protection (if available). Run the Kaspersky installer again. Download the official Kaspersky Kavremover tool

Warning: Re-enable these after Kaspersky installs successfully.

Part 3: The "Driver Conflict" Deep Clean If quick fixes fail, the problem is almost certainly a driver conflict or stale file . Fix 4: Use the Official Kaspersky Removal Tool (kavremover) Kaspersky provides a dedicated tool to scrape every last trace of its drivers from the registry and file system. Step-by-step: