This error usually indicates a conflict between the new installation and existing system states.
Network drivers from applications like VMware , Cisco AnyConnect, or WinPcap often conflict with Kaspersky’s NDIS filter. kaspersky error 27300 klif.sys-x64
: Residual files from a previous Kaspersky installation can block new drivers from being written. This error usually indicates a conflict between the
klif.sys is Kaspersky’s low‑level system driver. Error 27300 generally indicates a conflict – often with another security driver (leftover antivirus, game anti‑cheat software like EasyAntiCheat, or even buggy VPN drivers). game anti‑cheat software like EasyAntiCheat
I ran into while trying to install or update the software. The error points to klif.sys-x64 , which is a core driver component. In my case, the installation would roll back, and the protection wouldn’t start.