: Windows has a limit on the number of network filter drivers that can be active; exceeding this limit prevents from installing. Third-Party Conflicts
Disable any other third-party firewalls (like ZoneAlarm or Comodo).
The following steps are consolidated from official support resources:
A: No. It is a legitimate Windows installer error. However, some malware uses driver names similar to klim6 to hide. Always download Kaspersky from the official website.
Before attempting a fresh install, ensure all traces of previous security software are gone. Use the Kavremover Tool : Download and run the official Kaspersky removal tool (kavremover) to purge all hidden files and registry keys. Remove Third-Party Antivirus