Here’s a useful troubleshooting post for the Kaspersky error installing driver klim6.sys (x64) during update — typically seen on Windows 10/11.
The error occurs when the installer cannot write the new driver to the C:\Windows\System32\drivers\ folder or properly register it with the Windows kernel. When this happens, Windows prevents the driver from loading, and Kaspersky aborts the installation.
If you see a "success" message, restart and try the installation again.
Third-party software (especially older security tools or system utilities like Glary Utilities, CCleaner, or Process Lasso) can block driver installation.
Most reliable solution: Safe Mode cleanup + reboot + offline installer.
The exact error code is often logged.
