If klim6sysx64 is not a known, legitimate driver, then writing an extensive troubleshooting guide would:
Kernel‑mode drivers have full system access. Installing an unknown one is like giving a stranger your house keys.
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.
If the driver keeps returning, a registry key is holding a reference.
Warning: Incorrect registry edits can break Windows. Back up your registry first.
Step 1: Press Win + R, type regedit, press Enter.
Step 2: Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
Step 3: Look for a key named klim6. If found, right-click and delete it.
Step 4: Also check:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\4d36e967-e325-11ce-bfc1-08002be10318
(That’s the storage volume class). Remove any UpperFilters or LowerFilters entries referencing klim6.
Step 5: Reboot.
If none of the above steps resolve the issue, it might be specific to your system configuration or a bug in the software. Consider reaching out to Kaspersky's customer support for more personalized assistance. error 27300 error installing driver klim6sysx64 exclusive
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. If klim6sysx64 is not a known, legitimate driver
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 common installation failure for Kaspersky security products,
occurring when the installer cannot properly register the network filter driver klim6.sys_x64 Kernel‑mode drivers have full system access
. This often happens because another application or a leftover driver currently has exclusive access
to the network stack or is blocking the NDIS filter installation. Core Causes Residual Files
: Leftover drivers from a previous Kaspersky installation that weren't fully removed. Third-Party Conflicts : Applications that use similar network filters, such as Cisco AnyConnect , can lock the driver. System Corruptions
: Damaged system files, registry entries, or an overloaded OS can prevent new driver registration. Unsupported Hardware : Attempting to install on ARM-based processors
(like Snapdragon), which are often unsupported by standard Kaspersky drivers. Kaspersky Support Forum Recommended Fixes
Error 27300 when installing a Kaspersky application for home
Error 27300
Context: Driver Installation Failure
Affected Driver: klim6sysx64.sys
Issue Type: Exclusive Access / Permissions Conflict
If the error persists, Windows Security is likely blocking you.
Step 1: Open Windows Security (search for it in the Start menu). Step 2: Click on Virus & threat protection. Step 3: Under "Virus & threat protection settings," click Manage settings. Step 4: Turn off Tamper Protection. Step 5: Also turn off Real-time protection temporarily. Step 6: Try the installation again. Important: Re-enable Tamper Protection after the driver installs successfully.