Error 27300 Error Installing Driver Klim6sysx64 Exclusive May 2026

Error 27300 occurs during Kaspersky installation when the application fails to install the klim6.sys driver, which is part of the Kaspersky Anti-Virus NDIS Filter. This driver intercepts network packets to protect your system, but installation often fails due to leftover traces from previous versions, conflicting third-party network drivers, or damaged system services. Top Recommended Solutions

Clean Residual Files with Kavremover: Most technical experts recommend using the official Kavremover tool. Boot your computer into Safe Mode. Run kavremover.exe as an Administrator.

Select the Kaspersky version you were trying to install and click Remove. Restart your PC and try a fresh installation.

Delete the Driver via Command Prompt: If residues remain, you can manually delete the service entry. Open Command Prompt as an Administrator. Type sc delete klim6 and press Enter. Restart your computer.

Fix Network Config Registry (Windows 7/8): If you are on an older OS, a registry tweak may be required.

Open regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network. Find the Config parameter and rename it to Config2. Restart and attempt the install again.

Enable Network Setup Service: Ensure the Network Setup Service is present and set to Manual startup. If this service is damaged, it can block the installation of NDIS filter drivers. Common Conflicts to Check

Third-Party Software: Applications like VMware, Cisco AnyConnect, or WinPcap use similar network filtering technology and can cause conflicts. Reinstalling these apps can sometimes reset the necessary libraries.

Unsupported Hardware: This error frequently occurs on devices with ARM processors (like Snapdragon), which are not supported by standard Kaspersky versions.

Error 27300 is a critical installation failure that occurs when a security application, typically from , cannot install the

NDIS filter driver. This error usually results in an automatic rollback of the installation process. Kaspersky Support Forum Common Causes

The error is often triggered by remnants of previous security software or conflicts within the Windows networking stack: Leftover Drivers : Uninstalled antivirus programs (like

, McAfee, or older Kaspersky versions) may leave "ghost" drivers or registry entries that block new driver installation NDIS Filter Limit

: Windows has a limit on the number of network filter drivers that can be active; exceeding this limit prevents from installing. Third-Party Conflicts

: Applications like VMware, Cisco AnyConnect, or WinPcap (NPF) use similar network filters and can interfere with the installation. OS Integrity Issues : Corruption in the Windows Cryptographic Services or the

folder can prevent the system from validating the driver's digital signature. Kaspersky Support Forum How to Fix Error 27300 1. Use Specialized Removal Tools

A standard uninstall often leaves traces behind. Use the official Kavremover tool to purge all remnants of previous installations Kaspersky Support Forum Run the tool in for maximum effectiveness. Reboot your PC immediately after the removal process. Kaspersky Support Forum 2. Manual Driver Cleanup

If the removal tool fails, you may need to manually delete the problematic service entry: Command Prompt as an Administrator. sc delete klim6

If successful, restart your computer and attempt the installation again. Kaspersky Support Forum 3. Update Network Stack Drivers Conflicts with third-party network software are common. Update or Reinstall error 27300 error installing driver klim6sysx64 exclusive

: If you use VMware or Cisco AnyConnect, try reinstalling them. This can sometimes refresh the NDIS filter stack and allow the new driver to register. Check Services : Ensure the Network Setup Service is present and set to startup in Windows Services ( services.msc 4. System File Repair

Corrupted system files are a leading cause of driver installation failures. System File Checker sfc /scannow in an elevated Command Prompt.

If errors are found, follow the prompts to repair them before restarting the installer. 5. Disable Driver Signature Enforcement (Temporary)

In rare cases, the system may block the driver due to signature validation issues.

Error 27300 when installing a Kaspersky application for home

Error 27300 (specifically involving the driver klim6.sys_x64_70_exclusive

) is a known issue occurring during the installation or upgrade of

security products. It typically indicates a conflict with the network filter driver or missing hardware dependencies. Core Cause

This error usually triggers because the installer fails to replace or initialize the Kaspersky Anti-Virus NDIS Filter driver. According to Kaspersky Support

, a specific and surprising cause for this on some systems is the absence of a connected keyboard during the installation process. How to Fix It

If you are encountering this error, follow these verified steps: Connect a Physical Keyboard

: If you are installing this on a server or a "headless" machine via remote desktop, ensure a physical keyboard is plugged into the device. Use the Kavremover Tool

: Residual files from a previous installation often block the new driver. Download the official Kaspersky removal tool (kavremover) to completely wipe old traces before retrying the install. Download the Latest Version

: Kaspersky has released patches for this specific bug. Ensure you are using the most recent installer from the Kaspersky Download Center Check for Driver Conflicts

: In some cases, other VPNs or firewall software with their own NDIS filters (like OpenVPN or Cisco AnyConnect) can cause "exclusive" access errors. Try temporarily disabling or uninstalling these before the Kaspersky setup. Technical Summary Error Code (Kaspersky Lab Interceptor and Masker) Primary Target Windows 10 / Windows Server Resolved in latest builds (March 2025) Are you seeing this error on a personal PC remote server

Error 27300 when installing a Kaspersky application for home

Error 27300: Troubleshooting Guide for Klim6sysx64 Exclusive Driver Installation

Are you encountering the frustrating "Error 27300" while trying to install the Klim6sysx64 exclusive driver? This error can be a major roadblock, preventing you from updating or installing the necessary drivers for your system. In this write-up, we'll guide you through the possible causes, solutions, and troubleshooting steps to resolve the issue. Error 27300 occurs during Kaspersky installation when the

What is the Klim6sysx64 exclusive driver?

The Klim6sysx64 exclusive driver is a software component developed by Kaspersky Lab, a well-known cybersecurity company. The driver is designed to interact with the Kaspersky antivirus software and provide enhanced system protection. The "exclusive" label suggests that this driver is specific to certain systems or configurations.

Causes of Error 27300

After researching and analyzing user reports, we've identified some potential causes of the Error 27300:

  1. Incompatible driver version: The Klim6sysx64 exclusive driver might not be compatible with your system architecture, operating system, or existing driver versions.
  2. Corrupted driver package: The driver installation package might be damaged or corrupted, preventing a successful installation.
  3. Conflicting system files: Other system files or drivers might be interfering with the installation process, causing the error.
  4. Insufficient privileges: The user account attempting to install the driver might not have the necessary privileges or permissions.

Troubleshooting Steps

To resolve the Error 27300, try the following steps:

  1. Reboot your system: A simple system restart can sometimes resolve the issue.
  2. Check system architecture and OS compatibility: Ensure that the Klim6sysx64 exclusive driver is compatible with your system architecture (x64) and operating system.
  3. Download the latest driver version: Get the latest driver package from the official Kaspersky website or the device manufacturer's website.
  4. Run the installation as administrator: Right-click the installation executable and select "Run as administrator" to ensure sufficient privileges.
  5. Disable antivirus software: Temporarily disable your antivirus software to prevent any conflicts during the installation process.
  6. Perform a clean boot: Restart your system in a clean boot state to minimize conflicts with other system files and drivers.

Advanced Troubleshooting

If the above steps don't resolve the issue, you may want to try:

  1. Driver package extraction: Extract the driver package to a temporary folder and then attempt to install from that location.
  2. System file checker: Run the System File Checker (SFC) tool to scan for corrupted system files.
  3. Event viewer analysis: Analyze the Event Viewer logs to identify any related errors or warnings.

Conclusion

Preventing Error 27300 in the Future

Once you have successfully installed your software, follow these best practices to avoid recurrence:

  • Use the vendor’s removal tool before reinstalling. Never simply uninstall security software via the Control Panel; always use the dedicated cleanup utility.
  • Disable Core Isolation (Memory Integrity) temporarily during installation if you see memory management errors alongside 27300. (Settings → Windows Security → Device Security → Core Isolation → Off → Reboot → Install → Re-enable).
  • Keep Windows Updated. Microsoft regularly patches the driver installation framework. Outdated builds are more prone to Error 27300.
  • Avoid concurrent antivirus installations. Never install two real-time antivirus products on the same machine.

Summary

The Error 27300 regarding klim6sysx64 is a classic case of "driver lock." The security software is doing its job too well—even after you try to uninstall it, the driver stays active to protect the system.

By using the official Kaspersky Removal Tool to forcefully clear the old files, you effectively remove the lock, allowing the new installation to proceed without the "exclusive access" conflict.

Feature name: Driver Install Troubleshooter — Exclusive-Mode Recovery

Goal: Automatically detect and resolve driver installation failures caused by exclusive-mode conflicts, locked files, or permission issues for the klim6sysx64 driver.

Key functions:

  1. Automatic diagnostics (one-click)

    • Scan running processes and services that may hold exclusive locks on the device or driver file.
    • Check driver signature and package integrity.
    • Verify Windows driver store and filter for klim6sysx64 entries.
    • Check user permissions and group policy settings that affect driver installs.

  2. Safe exclusive-mode release

    • Gracefully request closing or restarting offending processes (with user confirmation).
    • Temporarily suspend noncritical services that hold device handles.
    • Offer an automated safe reboot-to-minimal-state option (deselectable) that boots Windows into a minimal driver set to allow installation.

  3. Repair & reinstall

    • Back up and remove corrupt or conflicting driver versions from the driver store.
    • Reapply correct digital signature checks and repair the package.
    • Reinstall klim6sysx64 with verbose logging and fallback to an alternate installation method (PnP install, devcon, or driver package installer).

  4. Elevated permissions flow

    • Detect when elevation is required and provide a single UAC prompt to run the fix.
    • Offer guidance for domain environments (group policy, SCCM) and provide exportable remediation steps for admins.

  5. User-facing output & rollback

    • Clear, actionable error messages and recommended next steps.
    • Detailed log file (timestamped) and one-click copy/share for support.
    • Automatic rollback to previous driver state if installation fails or device becomes unstable.

  6. Safety & safeguards

    • Verify driver signature and source before any removal.
    • Require explicit consent before disabling services or rebooting.
    • Option to create a system restore point before changes.

Implementation notes:

  • Expose as a standalone Troubleshooter UI and as a command-line tool for IT automation.
  • Provide integration hooks for OEM installer packages and enterprise deployment tools (SCCM, Intune).
  • Use platform APIs: SetupAPI, Windows Driver Frameworks, Restart Manager, and Device Console (devcon) where appropriate.

Minimal UX flow:

  1. User clicks “Fix Error 27300”.
  2. Tool runs quick scan → shows causes found (e.g., "Device in exclusive use by process XYZ").
  3. User chooses automatic fix or manual steps.
  4. Tool performs fixes, reinstalls driver, shows success/failure and log.

Would you like a short mockup of the UI text and button labels for this troubleshooter?

Error 27300 is a critical installation failure that occurs when a Kaspersky application cannot install a specific driver—typically klim6.sys_x64

, which is the Kaspersky Anti-Virus NDIS Filter driver. This driver is responsible for intercepting network packets to scan for threats. The error prevents the security software from completing its setup and often stems from conflicts with existing network filters, corrupted system catalogs, or leftover driver fragments. Kaspersky Support Forum Core Causes Driver Conflicts:

Interference from third-party network drivers like VMware Workstation, Cisco AnyConnect, or WinPcap. System Integrity Issues:

Corruption in the Windows "catroot2" folder, which stores driver signatures and certificates. Filter Limits:

Windows has a limit on the number of network filter drivers that can be active simultaneously; exceeding this can block the installation of new ones. Incomplete Uninstalls:

Residual files or registry keys from previous Kaspersky installations can block the current installer from gaining "exclusive" access to the driver path. Kaspersky Support Forum Recommended Fixes

Error 27300
Context: Driver Installation Failure
Affected Driver: klim6sysx64.sys
Issue Type: Exclusive Access / Permissions Conflict

Method 1: Run the Official Kaspersky Removal Tool

Because the error relates to a Kaspersky driver, the vendor provides a specialized tool to clean up locked files and registry keys.

Step 1: Download the kavremover tool from the official Kaspersky support site. Step 2: Restart your computer into Safe Mode (Press F4 after reboot, or use msconfig → Boot → Safe boot). Step 3: Run kavremover.exe as Administrator. Step 4: Type the security code shown on screen. Step 5: Select the Kaspersky product you were trying to install (or select "All detected products"). Step 6: Click "Remove." The tool will forcibly delete all Kaspersky drivers, including klim6sysx64. Step 7: Reboot normally and attempt the installation again.

Frequently Asked Questions

Q: Is Error 27300 a virus? A: No. It is a legitimate Windows installer error. However, some malware uses driver names similar to klim6 to hide. Always download Kaspersky from the official website.

Q: Can I ignore the error and use the PC without the driver? A: No. The klim6 driver is core to Kaspersky’s protection. Without it, the antivirus will run in a degraded state (real-time protection will fail). You must fix the error.

Q: What if I don’t use Kaspersky but still see this error? A: Some third-party driver updaters or system optimizers incorrectly try to install renamed copies of klim6. Run a full malware scan using Windows Defender Offline. Troubleshooting Steps To resolve the Error 27300, try

Q: Error 27300 appears with a different driver name (e.g., klif.sys). A: The same solutions apply. Replace klim6 with the driver name shown in your error. For klif, klhk, or klflt, use Methods 3, 4, and 5.

8. Check System Files

Corrupt system files can cause issues. Run the System File Checker:

  • Open Command Prompt as Administrator.
  • Type sfc /scannow and press Enter.