Error 27300 Error Installing Driver Klim6sysx64 Exclusive !exclusive! -
When you see this, the operating system’s Plug and Play Manager or the Kernel-Mode Driver Framework (KMDF) is rejecting the installation request.
Even if you have used Kaspersky software before, its uninstallation process may leave behind fragments. These orphaned files and registry keys can directly conflict with a new installation attempt, resulting in the 27300 error.
Look for leftover registry keys:
If the removal tool fails, you may need to manually delete the problematic service entry: Command Prompt as an Administrator. sc delete klim6
If the system still thinks an exclusive instance of klim6.sys exists, you must manually sweep the registry. error 27300 error installing driver klim6sysx64 exclusive
Corruption in the Windows Cryptographic Services or the catroot2 catalog database, which prevents Windows from verifying the digital signature of the driver.
If you are trying to install or update Kaspersky antivirus software and encounter the dreaded you are not alone. This is a common, frustrating issue where Kaspersky’s NDIS network filter driver fails to load properly, often accompanied by the message that the driver is in an "exclusive" state or blocked. When you see this, the operating system’s Plug
Elias froze. The error code 27300 in the proprietary manual meant "Exclusive Hardware Lock." The driver couldn't install because the hardware itself was refusing to accept the software handshake.
Windows incorporates a security feature called Driver Signature Enforcement, which only allows drivers that have been digitally signed by Microsoft to be loaded. In some cases, this security feature can be overzealous and block the klim6.sys_x64 driver if it is not recognized, or if its signature cannot be verified due to a system certificate error, causing the installation to fail with a 27300 error. Look for leftover registry keys: If the removal
The failure to register klim6.sys_x64 is rarely an issue with the Kaspersky installer itself. Instead, it is usually caused by environmental conflicts within Windows: