Error 27300 Error Installing Driver Klim6sysx64 Exclusive May 2026

reg query "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager" /v PendingFileRenameOperations

Error 27300: "Error installing driver klim6sysx64 (exclusive)" is a textbook case of Windows security and driver conflict mechanisms working as designed, but inconveniently for the user. The error is not a hardware failure nor a fatal OS corruption. It is simply Windows telling you: "Another process has a private (exclusive) hold on this driver file or its registry entries."

By systematically removing old antivirus remnants with the kavremover tool, temporarily disabling Windows Tamper Protection, manually scrubbing the driver store, and cleaning related registry keys, you will overcome the error. In the rare event that all software methods fail, consider performing a Windows In-Place Upgrade (keeping your apps and files) to rebuild the driver installation subsystem.

Remember: Patience is key. Kernel driver errors require a methodical approach. Do not skip the reboot steps—driver locks are often released only during the boot process.

Once you see the "Installation Complete" screen without the 27300 error, reboot immediately to finalize the driver load. After that, your security software will function perfectly, and klim6sysx64 will silently protect your system in the background.

Last updated: 2025. This guide applies to Windows 10, Windows 11, and Windows Server 2016/2019/2022.

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 typically occurs during the installation of Kaspersky software when the system fails to install the klim6.sys (Kaspersky Anti-Virus NDIS Filter) network driver. This is often due to existing driver conflicts, leftover files from previous installations, or an overloaded NDIS filter limit in Windows. Recommended Troubleshooting Steps

Perform a Clean Removal of Previous VersionsLeftover files from old Kaspersky installations frequently cause this conflict.

Download and run the official Kavremover tool to purge all traces of previous Kaspersky products. Restart your computer immediately after the tool finishes.

Manually Remove the Conflicting ServiceIf the driver is "stuck," you can manually delete the service via the Command Prompt: Open Command Prompt as an Administrator. Type sc delete klim6 and press Enter. Attempt to reinstall the software. error 27300 error installing driver klim6sysx64 exclusive

Check for Incompatible Network SoftwareThird-party applications that use NDIS filters can block new driver installations. Known culprits include: VMware (Workstation or Player) Cisco AnyConnect WinPcap or NPF Other Antivirus software (e.g., McAfee)

Solution: Temporarily uninstall these applications or update them to their latest versions to refresh their drivers before trying the Kaspersky installation again.

Verify Network Setup ServiceThe Windows Network Setup Service must be active for driver registration: Press Win + R, type services.msc, and press Enter. Locate Network Setup Service. Ensure the "Startup type" is set to Manual or Automatic.

Address Registry Issues (Windows 7/8 Only)If you are on an older version of Windows, renaming a specific registry key can sometimes clear driver registration blocks:

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network. Find the Config parameter and rename it to Config2. Restart and try the installation again. Common Error Variants

Error 0x8000ffff: Often linked to corrupt cryptographic services or catalog databases.

Error -2147024770: Usually indicates a general failure where the system cannot find or overwrite the specified driver file.

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:

Implementation notes:

Minimal UX flow:

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 security application fails to install the klim6.sys driver. This specific driver serves as a network filter (Kaspersky Anti-Virus Interceptor Mask), and its installation is often blocked by system integrity issues, leftover files from previous security software, or conflicts with other network-level drivers. Core Causes

Residual Files: Leftover drivers or registry keys from previous installations of Kaspersky or other antivirus programs (like McAfee or Sophos).

System Integrity Issues: Corruption in the Windows Cryptographic Services or the catroot2 catalog database, which prevents Windows from verifying the digital signature of the driver.

Software Conflicts: Conflicts with third-party network drivers from applications like VMware, Cisco AnyConnect, or WinPcap.

OS Limitations: Attempting to install on unsupported hardware (e.g., ARM/Snapdragon processors) or an outdated version of Windows. Recommended Solutions

The following steps are consolidated from official support resources:

Use the Kaspersky Removal Tool (kavremover):Run the kavremover tool as an administrator to purge any existing or corrupted Kaspersky files. This is the primary first step for most installation errors.

Clear Corrupted Cryptographic Catalogs:If the error code is 0x8000ffff, it often points to a corrupted catalog database. You can force Windows to rebuild it: Open Command Prompt as Administrator. Run net stop cryptsvc.

Rename the folder C:\Windows\System32\catroot2 to catroot2_old. Restart your PC and attempt the installation again.

Update Windows and Drivers:Ensure Windows is fully updated. In some cases, the error occurs because required system certificates or security patches are missing.

Check Service Startup Types:Open the Services menu (services.msc) and ensure the Network Setup Service is set to Manual. If this service is disabled or damaged, the driver cannot register itself.

Remove Conflicting Network Filters:Temporarily uninstall programs like VMware, Cisco AnyConnect, or other VPN/virtualization software that might be using the same NDIS filter layer.

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: Safe exclusive-mode release

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

Troubleshooting Error 27300: A Comprehensive Guide to Installing Klim6sysx64 Exclusive Driver

Are you encountering the frustrating Error 27300 while attempting to install the Klim6sysx64 exclusive driver? This error can be a significant roadblock, preventing you from completing the installation process and potentially leaving your system vulnerable to security threats or depriving you of essential functionality. In this article, we will delve into the causes of Error 27300, explore various troubleshooting methods, and provide a step-by-step guide to successfully install the Klim6sysx64 exclusive driver.

Understanding Error 27300

Error 27300 is a generic error message that appears during the installation of the Klim6sysx64 exclusive driver, often without providing detailed information about the cause. This lack of specificity can make troubleshooting more challenging. However, it is commonly associated with issues such as:

Preparation Steps Before Installation

Before proceeding with the installation of the Klim6sysx64 exclusive driver, ensure you have taken the following preparatory steps:

Troubleshooting Error 27300

If you encounter Error 27300 during the installation of the Klim6sysx64 exclusive driver, follow these troubleshooting steps:

Run a full system scan with:

Also check Task Scheduler and startup items for anything referencing klim6sysx64.

To solve the problem, it helps to understand the components involved:

In short: Your computer is trying to install a new version of a Kaspersky driver, but an old version (or a remnant of it) is currently running in the background and refusing to let go.