If none of the above works, you need to see exactly which process is locking the driver.
Step 1: Download Process Monitor (ProcMon) from Microsoft Sysinternals.
Step 2: Run it as Administrator.
Step 3: Stop the capture (Ctrl+E), then clear the log (Ctrl+X).
Step 4: Add a filter: Path → contains → klim6 → Include.
Step 5: Start the capture (Ctrl+E) and run your Kaspersky installer until the error appears.
Step 6: Stop the capture and look for entries with "Result: ACCESS DENIED" or "SHARING VIOLATION."
Step 7: The "Process Name" column will tell you the culprit (e.g., MsMpEng.exe = Defender, csrss.exe = another security tool).
If you are attempting to install or update a Kaspersky Lab security product and have been stopped dead in your tracks by the message "Error 27300 error installing driver klim6sysx64 exclusive," you are not alone. This is a known issue specific to Kaspersky software installations on Windows.
This guide breaks down what the error means, why it happens, and provides a step-by-step solution to get your installation back on track.
If the removal tool fails, a "ghost" (hidden) network adapter might be locking the driver.
Sometimes a previous installation failure leaves the klim6.sys file marked for deletion upon reboot. The installer sees that the file is "in use" (by the pending deletion flag) and cannot overwrite it.