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."
Repair & reinstall
The klim6.sys file is an NDIS (Network Driver Interface Specification) filter driver. Kaspersky uses it to intercept and scan network traffic for malicious activity before it reaches your operating system. When the Windows Network Setup Service or Cryptographic subsystem blocks this driver from locking onto your network adapters exclusively, the installer crashes with Error 27300. The main triggers for this failure include:
If the error persists, Windows Security is likely blocking you. error 27300 error installing driver klim6sysx64 exclusive
Select the Kaspersky version you were trying to install and click . Restart your PC and try a fresh installation.
If the driver file is corrupted or marked as "in use," force its removal.
: Applications that use NDIS filters, such as VMware Workstation, Cisco AnyConnect, or WinPcap, can interfere with the driver installation. is a textbook case of Windows security and
folder can prevent the system from validating the driver's digital signature. Kaspersky Support Forum How to Fix Error 27300 1. Use Specialized Removal Tools
If the automated tool fails, you may need to manually kick the driver out of your network configuration. Right-click the button and select Device Manager .
Usually indicates a general failure where the system cannot find or overwrite the specified driver file. Kaspersky uses it to intercept and scan network
Applications using custom virtual network adapters—such as VMware Workstation, Cisco AnyConnect, or WinPcap—frequently clash with the klim6.sys driver deployment.
Error 27300 is a common installation failure for Kaspersky security products,
To solve the problem, it helps to understand the components involved:
Follow these methods in order. Start with Method 1, as it solves 80% of cases.