Microsoft’s (part of Core Isolation) hypervisor-protects kernel mode drivers. If Kaspersky’s unsigned test driver conflicts, Windows blocks it with Error 27300.
In essence: Kaspersky cannot load its main protection driver (klif.sys) into the Windows kernel. kaspersky error 27300 klif.sys-x64
If any value exists referencing klif.sys , delete the entire entry. , only the values. delete the entire entry.