The error typically appears for one of the following reasons:
If none of the above solutions work, these advanced methods are available:
Error Description:
When installing, upgrading, or updating a Kaspersky endpoint or consumer security product (e.g., Kaspersky Endpoint Security, Kaspersky Internet Security, Kaspersky Total Security, Kaspersky Small Office Security) on a 64-bit version of Windows, the installation process fails midway with a message similar to:
“Error installing driver klim6.sys (x64)”
or
“Unable to install the klim6 driver. Installation will be aborted.”
The error typically occurs at the stage where Kaspersky attempts to load its low-level system driver responsible for filtering network and file system activity.
Affected Products:
Affected Windows Versions (x64):
The “Error installing driver klim6.sys (x64)” during Kaspersky update/installation is almost always caused by a remnant of a previous security product or a conflicting kernel driver. A systematic approach—clean removal of all AVs, driver conflict analysis, and safe mode cleanup—resolves the issue in over 95% of cases. The remaining rare cases typically involve OS corruption or unique enterprise policy restrictions, requiring vendor escalation. kaspersky error installing driver klim6sys x64 upd
Do not ignore this error – leaving the system without a successfully loaded klim6.sys means Kaspersky’s real-time protection will be inactive, leaving the system vulnerable.
Document version: 1.2
Last updated: 2025
Applies to: Kaspersky Endpoint Security 11.6.0+ and consumer products 21.3+
Understanding and Resolving the Kaspersky Error 27300 (klim6.sys)
The "Kaspersky error installing driver klim6.sys x64" is a technical hurdle typically accompanied by Error Code 27300. This error occurs when the Kaspersky installer fails to integrate the klim6.sys driver, which acts as an NDIS (Network Driver Interface Specification) filter responsible for intercepting and analyzing network traffic. Because this driver operates at a deep system level, its failure often stems from underlying conflicts with the operating system or other software. Primary Causes of the Error
The failure to install this specific driver is rarely a random event; it is usually triggered by specific system conditions:
Software Conflicts: The most frequent cause is the presence of other security software or leftover remnants from a previous antivirus installation. Programs that use similar NDIS filters, such as VMware, Cisco AnyConnect, or WinPcap, can also block the driver from binding to the network adapter.
Outdated Operating System: If Windows is not fully updated, required system components or digital certificates may be missing, preventing the secure installation of new kernel-mode drivers.
System File Corruption: Damaged Windows system files, particularly those related to the driver catalog (such as the catroot2 folder), can prevent the OS from recognizing or verifying the new driver.
Filter Limit Exceeded: Windows has a built-in limit on the number of network filter drivers that can be active simultaneously. If this limit is reached by other software, the Kaspersky driver cannot be added. Effective Troubleshooting Strategies The error typically appears for one of the
To resolve this issue, you must systematically clear these bottlenecks:
Error 27300 when installing a Kaspersky application for home
The infamous Kaspersky error installing driver klim6sys x64 upd!
Don't worry, I'm here to help you troubleshoot. Here's a step-by-step guide to resolve the issue:
What is klim6sys x64 upd?
klim6sys is a system driver used by Kaspersky antivirus software. The x64 suffix indicates it's a 64-bit driver, and upd suggests it's an updated version.
Causes of the error: The error may occur due to various reasons, including:
Troubleshooting steps:
klim6sys x64 upd driver:
Still having issues? If none of the above steps resolve the issue, you can:
The error installing the klim6.sys_x64 driver (often associated with Error 27300 If none of the above solutions work, these
) usually occurs because of leftover files from previous installations, conflicts with third-party network drivers, or a limit on the number of network filter drivers allowed by Windows. Recommended Solutions Clean Up Previous Installations : Use the official kavremover tool
to completely strip away traces of old Kaspersky versions. Run it as an Administrator, preferably in , then restart your computer. Manual Driver Removal
: If the error persists, you can manually delete the driver service using the Command Prompt (Admin): sc delete klim6 Try installing the application again. Check Third-Party Conflicts : Programs that use NDIS filters (like Cisco AnyConnect
) can interfere. Try updating or temporarily uninstalling these applications to resolve the conflict. Fix Registry Issues (Windows 7/8 only) : If you are on an older OS, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network in the Registry Editor and rename the parameter to , then restart. Disable Driver Signature Enforcement : For certain error codes (like 2146500025
), you may need to temporarily disable driver signature verification through Windows advanced startup settings before retrying the installation. Update Root Certificates
: Ensure your Windows is fully updated. If updates are restricted, manually update the root certificates to ensure the installer's digital signature is recognized. Proactive Troubleshooting If these steps do not work, check your Base Filtering Engine (BFE) service in services.msc
to ensure it is running, as Kaspersky requires it to install network drivers. Are you seeing a specific numerical error code (e.g., 27300: 2147024894) alongside the driver message?
Error 27300 when installing a Kaspersky application for home
Here’s a complete troubleshooting review for the error: “Kaspersky error installing driver klim6.sys (x64) update” on Windows 64-bit systems.