Kaspersky Error Installing Driver Klim6sys X64 Upd Free May 2026

The Error 27300 involving the klim6.sys_x64 driver usually occurs during installation or updates because of conflicting network drivers, corrupted system files, or leftover traces from previous Kaspersky installations. The "Proper Story" (Root Causes)

This specific driver is the Kaspersky Anti-Virus NDIS Filter, which hooks into your network adapter. Common reasons it fails to install include:

Too many network filters: Windows has a limit on the number of network filter drivers; if you have multiple VPNs or security tools, it may fail.

Leftover traces: Fragments from an old version or a failed uninstall can block the new driver.

Conflicting software: Third-party apps like VMware, Cisco AnyConnect, or WinPcap use similar filters and can interfere.

Digital signature issues: Older versions might have driver signature problems on newer Windows 10/11 updates. How to Fix the Error

Use the Kaspersky Removal Tool (kavremover)This is the most effective solution for clearing stuck driver fragments. Download the official kavremover utility. Boot your PC into Safe Mode. Run kavremover.exe as an Administrator.

Select the version you are trying to install/remove and click Remove. Restart your computer in normal mode.

Manually Remove the ServiceIf the removal tool fails, try deleting the driver service manually via the command line. Open Command Prompt as Administrator. Type sc delete klim6 and press Enter.

If you see a "success" message, restart and try the installation again.

Check for Conflicting Network AppsTemporarily uninstall or update applications that use NDIS filters, such as Cisco AnyConnect, VMware Workstation, or WinPcap. Once Kaspersky is installed, you can usually reinstall these tools.

Verify System IntegrityCorrupted system files can block driver registration. Open Command Prompt as Administrator. Run DISM /Online /Cleanup-Image /RestoreHealth. Run sfc /scannow after the first command finishes.

Manual Driver InstallationYou can attempt to add the filter directly to your network properties: Go to Network Connections (ncpa.cpl). Right-click your active adapter -> Properties. Click Install -> Service -> Add.

Select Kaspersky Anti-Virus NDIS Filter. If missing, use Have Disk and point it to the klimx64 folder in your Kaspersky installation directory.

Are you getting a specific error code (like 2147024894) alongside the driver name, or did this happen during a Windows update? kaspersky error installing driver klim6sys x64 upd

When the "Error 27300" interrupts your Kaspersky installation, it's usually because the driver—the engine behind the Kaspersky NDIS 6 Filter

—is being blocked by digital signature issues, leftover driver fragments, or conflicting network software.

Here is a troubleshooting story to guide you through the most effective fixes: 1. The "Ghost Driver" Cleanup

Often, a previous version didn't leave cleanly. You must use the official kavremover tool to scrub the system. Run it in Safe Mode

: This ensures no active processes protect the leftover files. Force-Delete the Service : Open Command Prompt as Administrator and run: sc delete klim6 . This clears the way for a fresh driver registration. 2. The Registry Reset (Windows 7/8 Users)

For older systems, the network configuration registry can become "stuck." Registry Editor Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network parameter and rename it to your computer and try the installation again. 3. The Manual Driver Handshake

If the installer keeps failing, you can sometimes bypass it by installing the driver yourself: Locate the

file (often found in the extracted installation folder or temporary files). Right-click it and select

Once Windows confirms the driver is added, restart the main Kaspersky installation. 4. Overcoming Signature Blocks If your error code is 2146500025 , Windows may be rejecting the driver's digital signature.

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 The Error 27300 involving the klim6

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.

Fixing the "Kaspersky Error Installing Driver klim6.sys x64"

If you are trying to install or update Kaspersky Lab products—like Kaspersky Internet Security, Total Security, or the new Kaspersky Standard/Plus—and you are hit with an error regarding klim6.sys, you aren't alone. This specific driver is the Kaspersky Anti-Virus Network Filter, and it is notorious for causing installation "rollbacks" or "Error 1310/1603" messages on 64-bit Windows systems.

This error usually stems from a conflict with a previous installation, leftover driver fragments, or Windows holding onto a locked file that the installer cannot overwrite. Here is how to fix it and get your protection back up and running. 1. Use the Kaspersky Products Removal Tool (Kavremover)

A standard uninstall through the Control Panel often leaves the klim6.sys driver behind in the Windows drivers folder. Kaspersky provides a specialized utility called Kavremover to wipe these stubborn leftovers.

Download the kavremover.exe from the official Kaspersky support website.

Boot your computer into Safe Mode (this is crucial, as it prevents the driver from being "in use"). Uninstall any other security software using its dedicated

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

Restart your computer normally and attempt the installation again. 2. Manually Delete the Driver File

If the removal tool fails, you may need to take manual control of the file system. Navigate to C:\Windows\System32\drivers. Look for a file named klim6.sys. If you find it, right-click and Delete it.

Note: If Windows says the file is in use, you must do this in Safe Mode.

Check C:\Windows\SysWOW64\drivers as well (though it is primarily an x64 driver, leftovers can hide here). Try the installation again. 3. Clear the Filter Drivers in the Registry

Sometimes the "UpperFilters" or "LowerFilters" in the Windows Registry still point to the klim6 driver, causing the installer to think it’s already active. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\4d36e972-e325-11ce-bfc1-08002be10318.

In the right pane, look for UpperFilters. If you see klim6 listed there, right-click and Modify to remove only that specific name, leaving other values (like netvsc) intact.

Warning: Modifying the registry can be risky. Always export a backup of the key before changing it. 4. Reset Network Adapters

Because klim6.sys is a network filter driver, it attaches itself to your Network Interface Card (NIC). If the driver is "stuck," resetting your network stack can help. Open Command Prompt as Administrator. Type netsh winsock reset and press Enter. Type netsh int ip reset and press Enter. Restart your PC. 5. Disable Third-Party Firewalls or VPNs

If you have other security software or a VPN (like NordVPN, ExpressVPN, or Malwarebytes) installed, their own network drivers might be locking the network stack, preventing Kaspersky from "hooking" its driver into the system. Temporarily uninstall these programs, install Kaspersky, and then reinstall them afterward.

The klim6.sys x64 error is almost always a "file in use" or "access denied" issue. By using the Kavremover tool in Safe Mode, you eliminate 90% of the causes. If the problem persists, checking the System32/drivers folder and cleaning the Registry are your best bets for a clean install.

4.2. Remove Third-Party Antivirus Completely

5. Prevention Measures

Part 1: Understanding the Error – What is klim6.sys?

Before diving into fixes, let’s understand the culprit.