Error 27300 Error Installing Driver Klim6sysx64 Exclusive ((full)) 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.

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:

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?

How to Fix "Error 27300: Error installing driver klim6.sys_x64_Exclusive"

If you are trying to install or update Kaspersky security software and hit Error 27300, you aren't alone. This specific error typically points to a conflict with the Kaspersky Anti-Virus NDIS Filter driver. It essentially means the installer failed to register the network driver, often because a previous version is "stuck" or the Windows network stack is corrupted.

Here is a step-by-step guide to clearing this error and getting your protection up and running. 1. Use the Kaspersky Removal Tool (kavremover)

The most common cause is a leftover file from a previous installation. Standard Windows uninstallation often leaves registry keys or driver files behind. Download the official kavremover utility from Kaspersky. Boot your computer into Safe Mode. error 27300 error installing driver klim6sysx64 exclusive

Run the tool, select the product you were trying to install, and click Remove.

Restart your computer normally and try the installation again. 2. Manually Remove the klim6 Driver

If the automated tool fails, you may need to manually kick the driver out of your network configuration. Right-click the Start button and select Device Manager.

Go to the View menu at the top and select Show hidden devices. Expand Non-Plug and Play Drivers (or Network Adapters). Look for klim6 or Kaspersky Anti-Virus NDIS Filter.

Right-click it and select Uninstall. If prompted, check the box to "Delete the driver software for this device." Restart your PC. 3. Reset the Windows Network Stack

Sometimes the "Exclusive" part of the error indicates that Windows has locked the network interface, preventing new drivers from hooking in. Resetting the stack can clear this lock.

Type cmd in your Windows search bar, right-click it, and Run as Administrator.

Type the following commands one by one, hitting Enter after each:

netcfg -d (This performs a heavy reset of all network settings) netsh winsock reset netsh int ip reset Restart your computer. 4. Check for Third-Party Firewall Conflicts

If you have another firewall or a VPN (like NordVPN, AnyConnect, or OpenVPN) active, their drivers might be competing for "exclusive" access to the network stack.

Temporarily uninstall VPN software before installing Kaspersky.

Disable any other third-party firewalls (like ZoneAlarm or Comodo). Error 27300 occurs during Kaspersky installation when the

Once Kaspersky is installed, you can usually reinstall your VPN without further issues. 5. Clear the Temp Folder

Corrupted installation logs or temporary files can trigger 2700-series errors. Press Win + R, type %temp%, and hit Enter.

Delete everything in this folder (skip files that are currently "in use").

Try the installer again, right-clicking it and selecting Run as Administrator. Summary Checklist Did you run kavremover in Safe Mode? Did you delete hidden drivers in Device Manager? Did you reset the network stack via Command Prompt?

Pro Tip: Always ensure your Windows Updates are current before installing security software, as Kaspersky relies on specific Windows digital signature verifications that are updated through Microsoft.

Kaspersky Error 27300 occurs when the installer fails to load network filter drivers, usually triggered by leftover files from previous security programs, network driver conflicts, or system file corruption. Solutions include using the Kaspersky removal tool, deleting the "klim6" driver service via Command Prompt, removing conflicting third-party network software, and repairing system files. For more details, visit Kaspersky Support.

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

5. If you are certain the driver is legitimate (rare case)

Only proceed if you have confirmed the source is safe and the driver is required for some niche hardware:

  1. Enable test signing (temporary, for troubleshooting):
    bcdedit /set testsigning on (then reboot)
  2. Install the driver again.
  3. If it works, contact the vendor for a properly signed version.
  4. Disable test signing afterward:
    bcdedit /set testsigning off

But again – doing this for klim6sysx64 without knowing its origin is high‑risk.

Method 1: The Clean Install (Using the Kaspersky Removal Tool)

Standard uninstallation via the Windows Control Panel often leaves the locked drivers behind. You must use Kaspersky’s official tool.

  1. Download the Tool: Search for and download the Kaspersky Removal Tool (kavremover) from the official Kaspersky website.
  2. Run the Tool: Run the executable. You may need to enter a captcha code.
  3. Select the Product: The tool will detect any Kaspersky products installed. Select "Kaspersky Internet Security" (or whichever product is failing to install) from the drop-down menu.
  4. Remove: Click the Remove button. Wait for the process to finish and restart your computer when prompted.
    • Note: This tool is designed to aggressively force-delete locked drivers like klim6sysx64.
  5. Reinstall: After the restart, try running your original installer again. It should now succeed.

✅ Step 2 – Scan for malware

Upload the .sys file or the installer to:

If multiple engines detect it as malicious, delete it. Automatic diagnostics (one-click)

Troubleshooting Guide: How to Fix "Error 27300" and "klim6sysx64"

If you are attempting to install or update a Kaspersky Lab security product and have been stopped dead in your tracks by the message "Error 27300 error installing driver klim6sysx64 exclusive," you are not alone. This is a known issue specific to Kaspersky software installations on Windows.

This guide breaks down what the error means, why it happens, and provides a step-by-step solution to get your installation back on track.

Step 3: Perform a Clean Boot

  1. Press the Windows key + R to open the Run dialog box.
  2. Type msconfig and press Enter.
  3. Go to the Services tab, check "Hide all Microsoft services," and then click "Disable all."
  4. Go to the Startup tab and click "Open Task Manager."
  5. In Task Manager, disable all startup items.
  6. Close Task Manager and click OK in the System Configuration window.
  7. Restart your computer and attempt to install the driver.